Myelin is composed of______

Answers

Answer 1

Myelin is composed of glial cells

The primary function of myelin is to provide insulation to nerve fibers, also known as axons, to increase the speed of electrical impulses (action potentials) as they travel along the axon, this insulation is achieved through the formation of a myelin sheath, a multilayered structure that wraps around the axon. The myelin sheath is made up of lipid-rich layers and protein, with lipids accounting for about 70-80% of its dry weight, mainly in the form of cholesterol, glycolipids, and phospholipids.  Proteins account for the remaining 20-30%, and they play essential roles in maintaining the structure and function of myelin. Some important proteins include myelin basic protein (MBP), proteolipid protein (PLP), myelin-associated glycoprotein (MAG), and peripheral myelin protein 22 (PMP22).

Myelination is essential for the proper functioning of the nervous system, as it improves the efficiency and speed of nerve impulse transmission. The presence of myelin enables saltatory conduction, a mode of conduction in which action potentials jump between gaps in the myelin sheath, known as nodes of Ranvier. This rapid mode of transmission allows for efficient and timely communication between neurons, facilitating complex cognitive and motor functions in the human body. Myelin is composed of glial cells.

Learn more about myelin here:

https://brainly.com/question/28104242

#SPJ11


Related Questions

One of Guy’s favorite athletes has recently tested positive for illegal drug use and has been banned from athletic competition. What are four possible side effects of drug abuse that might affect this athlete’s future levels of physical fitness?

Answers

When an athlete is caught using performance-enhancing drugs, it has numerous implications. Four possible side effects of drug abuse that might affect this athlete's future levels of physical fitness include cardiovascular disease, decreased bone density, kidney disease, and liver disease.

Here's more information on each of these effects:

Cardiovascular disease: Athletes who use performance-enhancing drugs face a higher risk of heart disease. This is due to the increased stress on the heart, which can cause an enlarged heart, high blood pressure, and other cardiovascular issues.

Decreased bone density: Performance-enhancing drugs are frequently combined with long, intense training sessions. This can result in increased bone density. However, as the body becomes more dependent on these substances, it can reduce bone density, making bones more prone to fractures.

Kidney disease: When athletes use performance-enhancing drugs, the kidneys are under a lot of stress. Long-term use of performance-enhancing drugs, like steroids, can cause the kidneys to work harder than they should, potentially resulting in kidney disease.

Liver disease:Performance-enhancing drugs, like steroids, are processed in the liver. Long-term use of these drugs can cause damage to the liver, resulting in liver disease.

In conclusion, an athlete can face numerous health issues, including cardiovascular disease, decreased bone density, kidney disease, and liver disease, which can significantly affect his future levels of physical fitness.

For more such questions on  drugs, visit:

https://brainly.com/question/30392650

#SPJ8

If a patient was diagnosed with influenza and placed on droplet precautions, which type of ppe would be required?.

Answers

Answer:

Patient should be in a sterile environment. Washed hands in gloves. with a gown and face mask.

Explanation:

How many cups of water should you drink in a day?

A)6
B)8
C)5
D)2
I will give brainliest just help me please.

Answers

Answer: B) 8

Explanation:

The amount of water a person needs to drink in a day can vary depending on several factors such as age, gender, body weight, activity level, and climate. However, a general recommendation is to drink at least “8” cups or 64 ounces of water per day.


This recommendation is based on the fact that our bodies need water to function properly. Water helps regulate body temperature, transport nutrients, and remove waste. It's also important for maintaining healthy skin, muscles, and organs.

Answer:

B)8

Explanation:

The cardinal rule” that says Humans should drink six to eight 8-ounce glasses of water per day.

Is water good for you?

Getting enough water every day is important for your health. Drinking water can prevent dehydration, a condition that can cause unclear thinking, result in mood change, cause your body to overheat, and lead to constipation and kidney stones.

What happens if you drink water everyday?

When you drink too much water, your kidneys can't get rid of the excess water. The sodium content of your blood becomes diluted. This is called hyponatremia and it can be life-threatening.

What happens when you start drinking more water?

The digestive system functions better with adequate hydration, preventing constipation. Water also helps flush toxins from the body, promotes good kidney function, keeps your joints and muscles lubricated, supports healthier and younger-looking skin, and helps regulate body temperature.

Thus, pick B for your answer.

Which of the following take place in the mitochondria? Select all that apply.

glycolysis

citric acid cycle

electron transport chain

oxidative phosphorylation

Answers

Answer:

B. Citric acid cycle

C. electron transport train

D. oxidative phosphorylation

Explanation:

The citric acid cycle, the electron transport chain, and oxidative phosphorylation take place in the mitochondria. Glycolysis takes place in the cytosol.

(explanation from Edg.)

During a conflict, sometimes each person eases up to come to a solution. This is referred to as:
A. A compromise
B. A meditation
C. A negotiation
D. None of the above

Answers

You're answer here should be A- A compromise

Answer:

Answer is- A Compromise

7. If Bob has a low temperature reading in his fingers, might he be stressed or relaxed?

Answers

Bob will be stressed out
If his temperature is reading low bob is stressed

Which career may be a good fit for you if you enjoy planning meals and learning about proper nutrition?

Which career may be a good fit for you if you enjoy planning meals and learning about proper nutrition?

Answers

Answer:

Registered Dietitian

Explanation:

Dietitians deal with meal prepping and nutritional advice.

what critical role is often played by pigs in the epidemiology of influenza virus?

Answers

Pigs are known to be one of the most important animal hosts in the epidemiology of influenza virus.

They are susceptible to both avian and human influenza viruses, making them a potential site for genetic reassortment of the virus. This means that if a pig is infected with both a human and avian influenza virus at the same time, the viruses can mix and create a new strain that could potentially be more infectious or deadly to humans. Pigs are also often involved in the transmission of the virus from birds to humans or from pigs to humans. Therefore, it is crucial to closely monitor the health of pigs in order to prevent the spread of influenza virus.

Pigs play a critical role in the epidemiology of influenza viruses due to their ability to act as "mixing vessels." This occurs when pigs are simultaneously infected with both human and avian influenza viruses. The genetic material of these viruses can reassort, creating new strains that may have the potential to infect humans. This reassortment can lead to the emergence of novel pandemic strains. Pigs also serve as amplifying hosts, increasing the likelihood of interspecies transmission. Therefore, monitoring and controlling influenza in pigs is essential for public health and pandemic preparedness.

To know about Pigs :

https://brainly.com/question/31577091

#SPJ11

Autism is now understood in all of the following ways EXCEPT _____________.Select one:a. autism is caused by maternal deprivationb. autism has a biological basisc. autism is characterized by heterogeneityd. autism is a quantitative trait normally distributed in the populationAnswer: a

Answers

Communication and social interaction issues, as well as repetitive or limited behaviors or interests, are common in people with ASD. Additionally, people with ASD might move, pay attention, or learn in different ways.

People vary greatly from one another. On the other hand, there are key traits that are connected to ASD. The three main characteristics are 1) poor social skills, 2) difficulty with expressive and receptive communication and 3) the presence of restrictive and repetitive behaviors.

Learn more about ASD

brainly.com/question/27412632

#SPJ4

Does Carbon Monoxide affect the PaO2 and does it precepitate methemoglobinemia?

Answers

Yes, carbon monoxide (CO) can affect the partial pressure of oxygen (PaO2) in the blood and can also lead to the development of methemoglobinemia.

Methemoglobinemia is a rare blood disorder characterized by the presence of elevated levels of methemoglobin, a form of hemoglobin that cannot effectively bind and transport oxygen. Hemoglobin is the protein in red blood cells responsible for carrying oxygen throughout the body. In methemoglobinemia, a specific enzyme called cytochrome b5 reductase, which normally converts methemoglobin back to its functional form, is either deficient or dysfunctional.

As a result, methemoglobin builds up in the blood, leading to reduced oxygen-carrying capacity. Symptoms of methemoglobinemia may include bluish discoloration of the skin, lips, and nails (cyanosis), shortness of breath, fatigue, headache, and in severe cases, organ failure or even death. Methemoglobinemia can be either inherited or acquired. Inherited forms are typically caused by genetic mutations, while acquired forms can be triggered by exposure to certain medications, chemicals, or toxins.

To know more about Methemoglobinemia refer to-

brainly.com/question/31912326

#SPJ4

Why is it necessary to convert carbohydrates into sugar?

Answers

Answer:

Because the body turns carbohydrates into glucose, eating carbohydrates makes blood sugar levels rise. But that doesn't mean you should avoid carbohydrates if you have diabetes. Carbohydrates are a healthy and important part of a nutritious diet.

Answer:

Sugar, in the form of glucose (C6H12O6), is a simple sugar that the human body can easily process and break down. Carbohydrates are a very important  part of a healthy diet. We can't just break down bread into energy; we need to convert those carbs into glucose, and from there, break it down further into ATP through chemical processes/reactions.

a one-pot dish in america would be considered a meal if it contained

Answers

In America, a one-pot dish can be considered a meal if it contains a balance of carbohydrates, proteins, and vegetables. The dish should be filling and nutritious enough to provide sustained energy and keep hunger at bay.

One-pot dishes are popular because they are easy to prepare and require minimal cleanup. Examples of one-pot meals include casseroles, stews, and soups. These dishes can include ingredients like rice, pasta, beans, meat, poultry, fish, vegetables, and spices. They can also be customized to suit different dietary preferences and restrictions. For instance, a vegetarian one-pot dish can contain lentils, quinoa, and roasted vegetables, while a gluten-free option can use gluten-free grains like brown rice or quinoa. Ultimately, a one-pot dish is a versatile and satisfying meal option that can be enjoyed by anyone looking for a hearty and easy-to-prepare meal.

Another example might be a chicken and rice casserole, which combines chicken pieces, rice, vegetables like carrots and peas, and a creamy sauce. Both of these dishes provide essential nutrients from various food groups, making them well-rounded meals that can be enjoyed with minimal cleanup. Overall, one-pot dishes in America are popular for their convenience and satisfying, balanced nutrition.

To know more about  carbohydrates visit:-

https://brainly.com/question/1558514

#SPJ11

A nurse documenting and then client medical record. which of the following entry should the nurse report? A. incision without redness or drainage B. administered pain medication C. oral temperature slightly elevated at 0800 d. drink an adequate amount of fluid with a meal.

Answers

A nurse is documenting in a client's medical record. Administered pain medication should be entered in the nurse report. Any action and change to the client's condition should be recorded.

You may make your documentation as accurate and helpful as possible by using the following hints, suggestions, and best practices :-

Be precise : Real-time accurate note-taking is required. Documentation that is inaccurate or deceptive is unethical and could hurt patients.Avoid Submitting Late: Inaccuracies may be introduced by late entries. Follow your employer's late entry policy and be sure to explicitly identify any late entry notations if you need to document something after the fact.Prioritize Legibility: Your paperwork must be easy to read for other people. Additionally, clear writing increases your authority and credibility. Employ the Proper Tools: Legal processes may make use of nursing records. Because of this, only use blue or black ink, and make corrections by initialing the material rather than erasing it from a nursing document.

To learn more about nursing documentation visit;

https://brainly.com/question/29655021

#SPJ4

HELP ME OUT PLSSSSSSSS

HELP ME OUT PLSSSSSSSS

Answers

For 4 I think it’s 3 and for five I’m pretty sure it’s 1
I believe the answer is

4.) 0.8 sec
5.) relaxation of the atria

Sorry if I am wrong

It is important to understand where to find calcium in food, but there are a variety of factors that can interfere with the absorption of even the best sources of calcium.
Which of these statements describe ways calcium bioavailability or absorption may be reduced?

Answers

Several factors may result in decreased calcium bioavailability or absorption:

1. choose calcium-rich foods that are high in oxalates, such spinach

2. ingesting significant quantities of calcium all at once

What does calcium do, and why is it important?Your body needs calcium to create and maintain healthy bones and to perform many other vital processes. The body contains the greatest calcium of any mineral. To give bones and teeth structure and hardness, about all of the body's calcium is stored in these tissues. Although it also plays a crucial role in blood clotting, assisting in muscle contraction, controlling regular heart rhythms, and maintaining normal neural activities, calcium is a mineral that is most frequently linked to strong bones and teeth.The typical adult need 1,000 milligrammes of calcium each day. For men and women over the age of 71, the dosage rises to 1,200 mg per day.

To learn more about calcium, refer to:

https://brainly.com/question/21463084

When should gloves be donned if you are wearing additional ppe?.

Answers

If you are wearing additional PPE, gloves should be donned as the first step for the appropriate order of donning PPE. Donning PPE is an essential step to protect yourself from contracting or spreading an infection. The correct order of donning PPE is important to minimize the risk of contamination.

The order to don PPE is very important to the effective use of PPE. The following order is generally suggested:Hand hygiene.

Gown or apron.

Face mask or respirator.

Eye protection.

Gloves.

Each of these steps must be performed carefully and correctly, in order to minimize the risk of self-contamination or transmission of an infectious agent. You should follow the correct order of donning PPE to make sure that you are properly protected. Additionally, you should always perform hand hygiene before and after donning PPE. This will help you to keep yourself and others protected. Finally, it is essential that you understand the importance of PPE and use it correctly.

To know more about contamination visit:

https://brainly.com/question/28328202

#SPJ11

Find the 10th term of the geometric sequence 3, 6, 12, ...

Answers

Answer:

3, 6, 12, 24, 48, 96, 192, 384, 768, 1536

10th term = 1536

Explanation:

The tenth term is 1,536.

(Introduction to Health Science - EL3601)
Choose the correct abnormal respirations being described. A patient is having difficult and labored breathing. A patient’s respirations are quick and shallow, with a rate of 40 breaths per minute. The character of a patient’s respirations is noisy, and it sounds like fluid is in the airway. The patient’s skin, nail beds, and mouth are bluish in color. A patient has normal respirations when sitting up, but experiences difficulty breathing when lying down.

Answers

The first two descriptions suggest the abnormal breathing pattern of "dyspnea" (difficult and labored breathing), while the third description indicates the abnormal breathing pattern of "stridor" (noisy breathing with the sound of fluid in the airway). The fourth description suggests the abnormal breathing pattern of "orthopnea" (normal breathing when sitting up, but difficulty breathing when lying down).

Dyspnea is a type of abnormal breathing pattern that is characterized by difficulty and labored breathing. This may be due to a variety of underlying conditions, such as lung disease, heart failure, or anxiety.

Quick and shallow breathing, with a rate of 40 breaths per minute, may also indicate dyspnea. This type of breathing pattern may be seen in patients with respiratory distress or other conditions that affect the lungs or airways.

Stridor is a type of abnormal breathing pattern that is characterized by a noisy sound in the airway, which may be due to obstruction or inflammation. It is often described as a high-pitched or harsh sound and may be accompanied by bluish discoloration of the skin, nail beds, and mouth, which suggests a lack of oxygen in the body.

Orthopnea is a type of abnormal breathing pattern that is characterized by difficulty breathing when lying down. This may be due to heart failure, lung disease, or other conditions that affect the respiratory system.

To learn more about Orthopnea here

https://brainly.com/question/28494743

#SPJ1

I need help with this please anything will help I don’t know how to do the rest I got confused thank you

I need help with this please anything will help I dont know how to do the rest I got confused thank you

Answers

Answer:

You match the numbers with the letters and then make the story

according to their ethical standards what are medical researchers required to give to patients before they participate in research studies

Answers

Answer:

The right to decide whether or not they want to participate in the research

Explanation:

What are common qualifications needed for Hospitality and Tourism careers? Check all that apply.
professional appearance and behavior
computer and telephone skills
knowledge of food and lodging
expertise in management and leadership
ability to handle multiple tasks at once
accuracy and attention to detail

Answers

Answer:

B, C, D

Explanation:

on E

1, 2, 4, 5, 6 are the common qualifications needed for Hospitality and Tourism careers.

What is Hospitality and Tourism career?

"The hospitality and tourism career cluster is focused on management, marketing, and operations of restaurants and food services, lodging, attractions, recreation events, and travel related services."

What are the common skills required for Hospitality and Tourism career?

Multitasking.Interpersonal.Customer service skills.Accuracy and attention in details.Management skills.Teamwork skills.Leadership skills.Communication skills.Professionalism.Foreign language skills.Problem solving skills.

To know more about Hospitality and Tourism careers here https://brainly.com/question/15294747

#SPJ2

what kind of immune response (humoral, cell-mediated or both) would be produced upon delivery of a subunit vaccine through intramuscular injection?

Answers

Both humoral and cell-mediated immune responses would be produced upon delivery of a subunit vaccine through intramuscular injection.

Subunit vaccines are vaccines that consist of purified protein subunits from the pathogen of interest. They are generally safer than other types of vaccines because they do not contain the whole pathogen. When a subunit vaccine is delivered through intramuscular injection, both humoral and cell-mediated immune responses would be produced.

The humoral immune response is mediated by B cells and produces antibodies that circulate in the blood and can neutralize the pathogen. The delivery of the subunit vaccine through intramuscular injection would stimulate the B cells to produce these antibodies. The cell-mediated immune response, on the other hand, is mediated by T cells and is important in controlling intracellular pathogens.

The delivery of the subunit vaccine through intramuscular injection would also stimulate T-cell responses and enhance the body's ability to fight the pathogen. This dual response makes subunit vaccines a promising option for the development of safe and effective vaccines against various infectious diseases.

Learn more about antibodies here:

https://brainly.com/question/27931383

#SPJ11

briefly explain the relationship between FTA and natural supplements

Answers

Answer:

Explanation:

Unlike drugs, supplements are not permitted to be marketed for the purpose of treating, diagnosing, preventing, or curing diseases. That means supplements should not make disease claims, such as “lowers high cholesterol” or “treats heart disease.” Claims like these cannot be legitimately made for dietary supplements.

a nurse is consoling the family of a client who has died after a long battle with lung cancer. what are nursing interventions to facilitate mourning?

Answers

Nursing interventions to facilitate mourning in this situation may include providing emotional support, promoting coping mechanisms, facilitating communication, and offering referrals for grief counseling.

The nurse can provide emotional support to the family by offering a listening ear and showing empathy for their loss. The nurse can also promote coping mechanisms by suggesting relaxation techniques or activities that may help the family deal with their grief. Facilitating communication between family members can also be helpful, as it may allow them to express their feelings and share memories of the deceased. Lastly, offering referrals for grief counseling or support groups may be beneficial for the family as they navigate through their mourning process.

learn more about Nursing interventions

https://brainly.com/question/8490867

#SPJ11

the more muscles i use the more my heart beats

a-true
b-false

Answers

Answer:

false your heart beats from nerves in your brain not the nerves in your muscles

Explanation:

Which of these tasks help to store information? Check all that apply.
saving data
logging in data
backing up data
searching data
retrieving data

Answers

saving data
backing up data

true or false? with some diseases, even a single case amounts to an epidemic.

Answers

The statement “with some diseases, even a single case amounts to an epidemic” is false because it is defined as the occurrence of more cases of a particular disease than expected in a given area or among a specific group of people over a certain period of time.

The threshold for what constitutes an epidemic varies depending on the disease and the population affected. However, a single case of a disease is generally not enough to be considered an epidemic, regardless of the disease in question.

There are some diseases that are extremely rare and a single case can be considered a public health concern, but this is not the same as an epidemic. For example, a single case of a highly infectious and deadly disease, such as Ebola or smallpox, would require an immediate public health response to prevent the spread of the disease and contain the outbreak, the statement is false.

To learn more about epidemic follow the link:

https://brainly.com/question/19491082

#SPJ4

there is no such thing as away'. when we throw anything away it must go somewhere.

Answers

Answer:

Deep, I vibe with this!

Why is stretching considered a good way to increase flexibility?
It increases blood flow to the muscles.
It decreases range of motion in joints.
It decreases blood flow to the muscles.
It makes muscles longer.

Answers

Among the options provided, the statement "It makes muscles longer" is the most accurate explanation for why stretching is considered an effective way to increase flexibility.

When we stretch our muscles, we apply a gentle force that elongates and lengthens the muscle fibers. This action increases the overall length and flexibility of the muscles over time. Regular stretching can gradually improve joint range of motion and increase overall flexibility.

Stretching has several benefits for increasing flexibility, including:

Increased muscle elasticity: Regular stretching improves muscle elasticity, allowing them to lengthen and extend easier. This increased elasticity leads to improved flexibility.

Improved muscle coordination: Stretching improves muscle coordination and balance by promoting better communication between the brain and muscles. Enhance coordination can improve flexibility and movement control.

Injury prevention: By increasing flexibility, stretching can prevent injuries during physical activities. Improved flexibility allows muscles and joints to move through a wider range of motion, reducing the risk of strains, sprains, and other musculoskeletal injuries.

It's worth noting that stretching alone may not be sufficient for optimal flexibility. Other factors, such as strength training, proper warm-ups, and maintaining a healthy overall fitness level, also contribute to flexibility improvement.

Regarding the other options provided,

Stretching does not decrease joint range of motion; rather, it increases it.

Stretching does not decrease blood flow to the muscles; in fact, it can enhance blood flow to the muscles, improving their function and aiding in recovery.

Therefore, the statement "It makes muscles longer" most accurately explains why stretching is considered an effective way to increase flexibility.

Stretching is considered a good way to increase flexibility because D. It makes muscles longer.

When you stretch, you deliberately lengthen and elongate your muscles, tendons, and surrounding connective tissues. This process, when performed regularly and properly, leads to an increase in muscle length and range of motion around the joints, ultimately enhancing flexibility.

Stretching helps to improve flexibility through various mechanisms:

1. Elongation of muscle fibers: Stretching puts tension on the muscle fibers, which stimulates them to lengthen and adapt over time. This helps to increase the overall length and extensibility of the muscles.

2. Improved muscle elasticity: Stretching can enhance the elasticity of muscles and tendons. Elasticity refers to the ability of tissues to recoil and return to their original length after being stretched. By regularly stretching, the muscles become more supple and resilient, allowing for greater flexibility.

3. Increased joint range of motion: By stretching the muscles and tissues around a joint, you can gradually increase the joint's range of motion. This is especially beneficial for activities that require a wide range of motion, such as dancing, gymnastics, or certain sports.

Learn more about connective tissues: https://brainly.com/question/408637
#SPJ11

which of these a part of good dental hygiene

Answers

Answer:

Explanation:

I believe this is a multiple choice that is missing the options..

Good dental hygience practices:

Brush teeth thoroughly twice a day and floss daily between the teeth to remove dental plaque.

Visit your dentist at least once a year, even if you have no natural teeth or have dentures.

Do not use any tobacco products.

Brush teeth thoroughly twice a day and floss daily between the teeth to remove dental plaque
Other Questions
HELP PLEASE I NEED IT ASAP what early approach in psychology encouraged the consideration of the whole perceptive experience? you have added two new hard disks to a windows computer. the disks are configured as basic disks. which of the following could be configured on these disks? (select two). What types of people fall under the supreme class? How long are Judgments liens effective in Illinois before having to renew it? If the length and width of rectangle A are each k times the length and width of rectangle B, which statement is true?A. The area of rectangle A is k3 times the area of rectangle B.B. The area of rectangle A is k times the area of rectangle B.C. The area of rectangle A is 2k times the area of rectangle B.D. The area of rectangle A is k2 times the area of rectangle B. which atom would become an ion with a +1 charge? According to a recent study, the average American household spends $1,700 on clothing per year, with a standard deviation of $530. What percent of households spend less than $1170 per year, based on this data? Let a 1 = 151 ,a 2 = 6243 , and b= 33h . For what value(s) of h is b in the plane spanned by a 1 and a 2 ? The value(s) of h is(are) (Use a comma to separate answers as needed.) Major producers of cotton include all of the following countries except __________. A. Brazil B. China C. India D. The USA Please select the best answer from the choices provided. A B C D. A hailstone is forming in the clouds so that its radius at the rate of 2 min/min. How fast is the at the moment when the radius is 3 mm? v = 4/3r^3 A sever weather watch means??? What structure is similar to the endoplasmic reticulum in other cells used for transport. (Timed) Solve the system of equations work shown What is the base of x2? Margo spends 0.25 of her paycheck on a new dress, One-eighthof her paycheck on shoes, and $24 on a birthday present. If she spent $60 altogether, how much was Margos paycheck? Avani's parents both work full time and do not arrive home until 8 p.m. each evening. Most nights, one of her parents picks up takeout or fast food to bring home for dinner. This is what Avani has known for the past several years, and it is widely accepted by her family. How could this likely impact Avani's relationship with food? She will carry the practice of eating primarily store bought meals into adulthood as a habit. She will learn to cook by herself and start preparing all the family's meals on her own. She will start eating her meals with friends' families so she can make healthier choices. She will speak with her parents about their work schedules to cook meals at home. Refer to the image on the right. Then, using the drop-down menu, identify the port. HDMI, FireWire, Ethernet, USB are potent stimulators of t cell responses and can result in overwhelming release of cytokines and cell death. to what extent were the american colonists justified in resisting british policies after the french and indian war leading to the american revolution?