a skeletal muscle contains bundles of elongated muscle fibre cells. what is the longest structure within each fibre?
Answers
The longest structure within each skeletal muscle fiber is the myofibril.
Myofibrils are composed of repeating units called sarcomeres, which are responsible for muscle contraction.
Myofibrils are long contractile fibres, groups of which run parallel to each other on the long axis of the myocytes (long single multinucleated cells that combine to form the muscle).
The myocytes run parallel to each other on the long axis of the cell.Myofibrils are bundles of protein filaments that contain the contractile elements of the cardiomyocyte, that is, the machinery or motor that drives contraction and relaxation.
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A skeletal muscle contains bundles of elongated muscle fiber cells. The longest structure within each fiber is myofibril.
Cylindrical elements known as myofibrils run the entire length of each muscle fiber and are in charge of producing force when the muscle contracts. Sarcomeres, the basic contractile units of skeletal muscle, are repeating units that make up these tissues.
Thin actin filaments and dense myosin filaments, which make up each sarcomere, combine to produce force and trigger muscle contraction. The Z-lines, which mark each sarcomere's borders, serve as the anchors for the myosin filaments.
The sarcomere shortens and the muscle contracts as the myosin and actin filaments pass one another. The myofibrils are attached to the sarcolemma, the cell membrane of the muscle fiber.
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Related Questions
It is environmental science
Answers
Answer:
The main biome in Alaska is Tundra.
Explanation:
According to the map the state Alaska's main environment is covered in light blue which in this case indicates the tundra biome. In case you were not aware Alaska is the northwestern most region.
I hope this helps! :D
how many times does a contractile vacuole contract in one minute?
Answers
The number of contractions of a contractile vacuole in one minute depends on the type of organism, but it usually ranges from 3 to 10 times per minute. The contractile vacuole is a specialized organelle found in some single-celled organisms such as protozoans.
basically It is filled with a liquid, and its main function is to pump excess water out of the cell to maintain osmotic balance. When the vacuole reaches a certain size, it will contract and expel some of the liquid, thus helping regulate the cell’s internal environment. The frequency of contraction can vary based on the needs of the organism.
For instance, if the environment is exceptionally dry, the contractile vacuole may contract more often to expel more water. Conversely, if the environment is wet, the vacuole may contract less often. Additionally, some species, such as the amoeba, have multiple contractile vacuoles, and each will contract at a different rate depending on the organism’s needs.
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How is the nervous system similar to the internet as a communication network?
Answers
Explanation:
The networks (nerve cells)and the hubs (brain and spinal cord) being the most obvious. One difference is the internet is always expanding but neuronal cells in humans do not divide.
The networks (nerve cells)and the hubs (brain and spinal cord) being the most obvious. One difference is the internet is always expanding but neuronal cells in humans do not divide.
What is the nervous system?The nervous system includes the brain, spinal cord, and complex network of nerves. The nervous system is divided into the CNS (central nervous system) and the PNS (peripheral nervous system)
The CNS consists of the brain and spinal cord. They are so important that the brain and spinal cord, located in the dorsal body cavity, are encased in bone for protection. The main function of the nervous system is to collect various sensory information. We process, interpret and integrate this information. Produces appropriate responses throughout the body.
Therefore, The networks (nerve cells)and the hubs (brain and spinal cord) being the most obvious. One difference is the internet is always expanding but neuronal cells in humans do not divide.
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Flowers shaped for their pollinators, specific camouflaged color patterns of animals, and a beaver's enormous front teeth for gnawing are all examples of
Answers
Flowers shaped for their pollinators, specific camouflaged color patterns of animals, and a beaver's enormous front teeth for gnawing are all examples of adaptation
What is adaptation ?The modification of an organism to its environment in order to increase its chances of survival is known as evolutionary adaptation, or simply adaptation.
A living thing can modify itself to fit its surroundings. A plant growing at a higher altitude, for instance, might change its metabolism or the types of nutrients it needs to thrive. Another perspective on adaptation is genetic.
An animal's morphological or behavioural characteristics that aid in their better survival in their environment are referred to as adaptations. In other words, an adaptation is something a person does or has on their body that facilitates locating food, water, partners, and shelter.
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Thermodynamics
Heat is thermal energy which is passed on or transferred from one object to another. You may have experienced the many different ways heat can transfer energy; from the rays of the sun, to flow of a breeze.
100% energy in the form of solar radiation
34% reflected from clouds & dust
02% Photosvnines
Wind 1%
Evaporating Water 23%
42% towards heating surface and atmosphere
It takes eight minutes for electromagnetic waves to transfer energy from the sun to the earth. This particular type of energy transfer is known as solar radiation.
As the radiation strikes the earth, molecules within the crust of earth begin to move. As the molecules in the earth begin to collide, the process of conduction begins. If you have ever visited the beach during the warm summer months, you have probably experienced walking on very hot sand. The hot sand is the result of the sun's rays transferring heat through the collision of molecules which is known as conduction. As the land of the earth becomes heated, the molecules in the air above the land are affected. As an air mass becomes warmer, it also becomes less dense and begins to rise. As the density changes and the air mass begin to flow, the process known as convection has begun.
Answer the following questions
1. A light was left on over night on a desk. What kind of heat was being let off from the bulb?
a. Convection
b. Conduction
c. Radiation
d. Solar
2. During the summer the energy from the sun causes the black top on some roads to get so hot, the tar bubbles on the surface. What kind of energy transfer causes the molecules within the black top to move?
a. Convection
b. Conduction
c. Radiation
d. Potential
3. Within the local weather report, high winds are said to be moving into the area. What type of energy is responsible for the flow of energy which creates wind?
a.
Radiation
b.
Convection
C.
Conduction
d.
Potential
4. Radiation is energy which is transferred through
a. Waves
b. Convection
c. Conduction
d. movement
5. Pam places a test tube containing water over a Bunsen burner and lights it. On another sheet of paper, describe the heating process of the contents of the test tube. Within your answer be sure to:
• Identify each phase of thermodynamics, including; conduction and convection
• Describe the movement of the water molecules
Answers
1) The correct answer is c. Radiation. The heat being let off from the bulb is in the form of thermal energy, which is transferred through electromagnetic waves, or radiation.
2) The correct answer is b. Conduction. The energy from the sun is transferred to the black top through radiation, but the heat causes the molecules within the black top to move through conduction, which is the transfer of heat through collisions between molecules.
3) The correct answer is b. Convection. Wind is created by the movement of air masses, which is driven by convection, the transfer of heat through the movement of fluids (in this case, air).
4) The correct answer is a. Waves. Radiation is the transfer of energy through electromagnetic waves, such as visible light, infrared radiation, and ultraviolet radiation.
5) As the Bunsen burner heats the test tube, the water molecules within the test tube begin to move faster and collide with one another, causing the temperature of the water to increase. This is an example of conduction, the transfer of heat through collisions between molecules. As the water near the bottom of the test tube is heated, it becomes less dense and begins to rise, while cooler water from the top of the test tube sinks down to take its place. This is an example of convection, the transfer of heat through the movement of fluids.
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Is fructose a mono,di, or polysaccharide
Answers
Answer:
Fructose is a monosaccharide. Although it has the same chemical formula as glucose, it has a different chemical structure.
What elements were formed during the process of nuclear fusion in stars and supernova?
Answers
In the centres of most stars, lighter elements like hydrogen and helium are fused to form the most prevalent elements, such as carbon and nitrogen. However, only large stars that die in supernova explosions may produce the strongest elements, including iron.
Large nuclear reactors make up stars. Massive atomic collisions that tear apart atoms in the centre of stars change their atomic structure and unleash a great amount of energy. The result is hot and brilliant stars. Stars are powered by nuclear fusion, an atomic reaction. Because they are so strong, supernovae produce brand-new atomic nuclei. When a big star collapses, a shockwave is created that may trigger fusion reactions in the star's outer shell. Nucleosynthesis, a process that results from these fusion processes, produces fresh atomic nuclei.
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Describe how the circulatory system allows the endocrine system to do its job?
Answers
Answer:
The circulatory system is the transport system for endocrine info. The endocrine chemicals and hormones must circulate through the body via blood vessels.
4. How do markhors get the energy they need to perform their life functions?
They are able to use a chemical reaction to convert the sun's energy.
They are skilled hunters that eat small ground mammals for energy.
They are herbivores that consume grasses and plants for energy.
They are carnivores and eat large animals, such as snow leopards.
Answers
Answer:
They are herbivores that consume grasses and plants for energy.
Explanation:
As everyone knows ,markhors are herbivores , and herbivores means plant eater ( the animals that eats plants) , so it eats grass , it is not an carnivor or an omnivore , so it don't eat other annimals , of corse , animals can't use chamisy things ,right? Tip: THEY DON'T EAT MEAT.
Answer: They are herbivores that consume plants and grasses for energy.
Explanation: They are herbivores, therefore they eat plants and grasses for energy :D
what is the relationship between a protein the cell and DNA?
a. DNA is produced by protein which is produced in the cell
b. dna controls the production of protein in the cell
c. protein is composed of DNA which is produced in the cell
d. a cell is composed of DNA and protein
Answers
Answer:
Cells contain DNA that controls the production of proteins. (2) DNA is composed of proteins that carry coded information for how cells function. (3) Proteins are used to produce cells that link amino acids together into DNA. (4) Cells are linked together by proteins to make different kinds of DNA molecules.
Explanation: Hope this helps!! :)
The bacterium Staphylococcus aureus is commonly found on the skin and rarely causes major problems. If it gets under the skin or into the lungs it can cause boils or pneumonia. If the strain of bacterium causing these problems is resistant to methicillin, the infections can be life threatening. Methicillin resistant Staphylococcus aureus or MRSA is, therefore, a major concern in hospitals and clinics. Supposing the death rate from MRSA lung infections is 20%, find the following probabilities: (a) Three of 20 patients with lung infections die. (b) Less than 3 die. (c) At least 3 die. (d) Between 6 and 3 die. (e) How many would you expect to die in a random sample of 20? of 15?
Answers
(a) The probability of three of 20 patients with lung infections dying is 0.02016. (b) The probability of less than 3 dying is 0.626. (c) The probability of at least 3 dying is 0.374. (d) The probability of between 6 and 3 dying is 0.10182. (e) We would expect 4 patients to die in a random sample of 20, and 3 patients to die in a random sample of 15.
The probability that 3 of 20 patients with lung infections die is 0.02016.
(a) The probability that 3 of 20 patients with lung infections die is: \(P(3) = \binom{20}{3} (0.2)^3 (0.8)^17 = 0.02016\).
(b) The probability that less than 3 die is: \(P(0) + P(1) + P(2) + P(3) = 0.390625 + 0.2016 + 0.03276 + 0.002016 = 0.626\)
(c) The probability that at least 3 die is: \(1 - 0.626 = 0.374\)
(d) The probability that between 3 and 6 die is: \(P(4) + P(5) + P(6) = 0.02916 + 0.0625 + 0.02016 = 0.10182\)
(e) The expected number of patients who would die in a random sample of 20 is: \(E(X) = np = 20(0.2) = 4\)
The expected number of patients who would die in a random sample of 15 is: \(E(X) = np = 15(0.2) = 3\)
The probability that 3 of 20 patients with lung infections die is calculated by using the binomial distribution. The binomial distribution is a probability distribution that describes the number of successes in a fixed number of trials. In this case, the number of trials is 20 and the probability of success is 0.2, which is the probability that a patient dies.
The probability that 3 of 20 patients with lung infections die is given by the following equation: \(P(3) = \binom{20}{3} (0.2)^3 (0.8)^17\) = 0.02016.
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Smart people answer this this is emt question
Answers
Answer:
respitory
Explanation:
minors or actual from the parents
1. Which statement describes cellulose? Cellulose gives cell walls of plants their rigid structure. Carbohydrates is another name for cellulose. A good source of cellulose comes from poultry products. Proteins are made from multiple types of cellulose.
I WILL GIVE BRANLIEST
Answers
Explanation:
Cellulose gives cell walls of plants their rigid structure.
Answer:
Cellulose gives cell walls of plants their rigid structure.
Explanation:
using the count data and observational data you acquired calculate the number of cfus in the original sample
Answers
Answer:
cuales son los datos ?
Explanation:
cuales son los datos
What type of technology takes scientists to depths they cannot reach by any other means?
Answers
Answer:
Scientific drilling
Explanation:
Like proves sent into outer space, scientific drilling is a technology used to obtain samples from places that people cannot reach.
during an ige-mediated hypersensitivity reaction, which leukocyte is activated? group of answer choices neutrophils monocytes eosinophils t lymphocytes
Answers
During an IgE-mediated hypersensitivity reaction, eosinophils are primarily activated.
IgE-mediated hypersensitivity reactions, also known as Type I hypersensitivity reactions, involve the activation of various immune cells. In these reactions, the initial exposure to an allergen triggers the production of specific IgE antibodies by plasma cells. These IgE antibodies bind to Fc receptors on the surface of mast cells and basophils, sensitizing them.
Upon subsequent exposure to the same allergen, cross-linking of the IgE antibodies occurs, leading to the degranulation of mast cells and basophils. This degranulation releases numerous inflammatory mediators, such as histamine, leukotrienes, and cytokines, which contribute to the characteristic symptoms of the allergic reaction.
Among the leukocytes involved in the response, eosinophils play a crucial role. Eosinophils are attracted to the site of the allergic reaction by the released chemotactic factors. Once recruited, eosinophils release their own inflammatory mediators, such as major basic protein, eosinophil cationic protein, and eosinophil-derived neurotoxin.
These mediators are particularly effective against parasitic infections and contribute to the prolonged inflammation seen in chronic allergic conditions like asthma and allergic rhinitis.
In contrast, neutrophils, monocytes, and T lymphocytes are not the primary cells activated in IgE-mediated hypersensitivity reactions. Neutrophils are typically involved in acute bacterial infections, while monocytes play a role in phagocytosis and antigen presentation.
T lymphocytes are more prominent in delayed hypersensitivity reactions mediated by T cells, such as Type IV hypersensitivity reactions.
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a dihybrid cross of fruit flies is used to examine inheritance patterns for eye color (black or white) and head shape (round or elongated). this cross produces 10,000 offspring, and the ratio is 1 (black eyes, round head): 1 (black eyes, elongated head): 1 (white eyes, round head): 1 (white eyes, elongated head). is this what you would expect from a dihybrid cross?
Answers
Yes, this is what you would expect from a dihybrid cross. The ratio of 1:1:1:1 indicates that the two traits, eye color and head shape, are independently inherited and follow the principles of Mendelian genetics. Each allele for eye color segregates independently of each allele for head shape, resulting in equal numbers of offspring with each combination of traits.
Yes, the results of this dihybrid cross for fruit flies, examining eye color (black or white) and head shape (round or elongated), align with the expected 1:1:1:1 ratio. This outcome suggests that the two traits are independently assorting, following Mendel's law of independent assortment.
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______________ direct RNA polymerase to the initiation site. Group of answer choices enhancers operons inducers primers promoters
Answers
Promoters direct RNA polymerase to the initiation site, the correct option is E.
Promoters are specific DNA sequences that serve as binding sites for RNA polymerase during the initiation of transcription. They are crucial in directing RNA polymerase to the correct start site for transcription to occur. Promoters contain specific nucleotide sequences recognized by RNA polymerase and other transcriptional regulatory proteins.
When RNA polymerase binds to the promoter region, it forms a stable transcription initiation complex, allowing for the initiation of RNA synthesis. Promoters play a vital role in gene regulation, as different promoters have distinct sequences and affinities for RNA polymerase and other regulatory factors, the correct option is E.
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The correct question is
______________ direct RNA polymerase to the initiation site.
A) Enhancers
B) Operons
C) Inducers
D) Primers
E) Promoter
BRAINLIEST FOR WHOEVER IS RIGHT!!
Select all the correct answers.
This chart presents data on greenhouse gas emissions caused by human activity from 1990 to 2012. Which questions would help clarify this evidence?
A. Which source of electricity generation caused the most emissions?
B. What types of industries are responsible for greenhouse gas emissions?
C. Which natural sources of greenhouse gas emissions are shown here?
D. Why is agriculture the largest source of greenhouse gas emissions?
E. What caused the dip in greenhouse gas emissions in transportation after 2007?
Answers
Answer:
A and C
Explanation:
This is the right answer! Please mark me Brainiest!! Hope that helped..
Answer:
A. Which source of electricity generation caused the most emissions?
B. What types of industries are responsible for greenhouse gas emissions?
D. Why is agriculture the largest source of greenhouse gas emissions?
These questions would help clarify the evidence presented in the chart. Understanding which sources of electricity generation emit the most greenhouse gases, what industries are responsible for these emissions, and why agriculture is the largest source could provide important context for understanding the data and its implications.
The plants in the
are true breeding.
Answers
The plants in the P generation are true breeding. True breeding refers to a breeding strategy in which parents always produce offspring with the same characteristics as themselves.
True-breeding strains are usually created by inbreeding, or breeding plants with similar characteristics over several generations until the offspring consistently express the same traits as their parents.In other words, true-breeding strains can self-reproduce, and their progeny will retain the same traits as the parents. So, the plants in the P generation are true breeding.
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is the ocean water alive
Answers
Answer:
no
Explanation:
no its not alive because its a liquid
Answer:
No
Explanation:
The ocean water isn't alive or considered an organism because of the fact that it doesn't have all 7 characteristics that are needed to be considered an organism. For example, reproduction......... it doesn't reproduce.
2. Within food chains
energy is
a) always increasing
b) always being but the environment as heat
c) doesn't change in amount and is recycled
d) continually being converted into matter
Answers
hello guys
i have a trivia about the bermuda triangle
who ever answer it first right ill make it brainliest
questions:
1.Name the first man who discover bermuda
2.What year did he discover it
3.did he came back safely?
Answers
Christopher Columbus was the earliest to have noticed the bermuda Triangle
1492
Yes he did as he wasn't aiming to visit the bermuda triangle.
Low gametic investment in gametes means that males will not be monogamous (T/F)
Answers
Low gametic investment in gametes means that males will not be monogamous is a False statement.
Low gametic investment in gametes does not necessarily mean that males will not be monogamous. Monogamy is a behavioral trait that can be influenced by various factors including social and environmental conditions. While some species with low gametic investment in males may exhibit polygamous behaviors, others may be monogamous. Therefore, there is no direct relationship between low gametic investment and male monogamy.
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A man with a specific unusual genetic trait marries an unaffected woman and they have 4 children. Pedigrees of this family are shown in parts a) through e), but the presence or absence of the trait in the children is not indicated. For each type of inheritance indicate how many children of each sex are expected to express the trait by filling in the appropriate circles and squares. Assume that the trait is rare and fully penetrant.a) Autosomal recessive traitb) Autosomal dominant traitc) X-linked recessive traitd) X-linked dominant traite) Y-linked trait
Answers
A) Recessive autosomal trait. A family's pedigree might reveal how diseases are passed down through the generations.
One of parents must possess the trait for it to be dominant. No generation will be spared from dominant features. If a trait is recessive, either parent needs to have it in order for it to be present because they can both be heterozygous. Every time the appropriate gene is present, the trait also exists (generally). The parents both are heterozygous ("carriers") of the recessive phenotype if they share the trait but none of their children do. An autosomal recessive condition known as with cf (CF) is brought on by a change in the CFTR gene on chromosome 7. A family's pedigree might reveal how diseases are passed down through the generations. standard nomenclature for pedigrees. Simple symbols are employed.
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explain why the difference in permeability or impermeability of the nephron loop is necessary for urine formation
Answers
The nephron loop (or loop of Henle) in the kidney is responsible for producing urine by regulating the concentration of solutes and water in the blood.
The loop is divided into two sections: the descending limb and the ascending limb. The descending limb is permeable to water but not solutes, while the ascending limb is permeable to solutes but not water.
This difference in permeability is necessary for urine formation because it creates a concentration gradient in the interstitial fluid surrounding the nephron loop.
As fluid travels down the descending limb, water is reabsorbed into the bloodstream due to osmosis, while solutes are concentrated in the tubule.
As fluid travels up the ascending limb, solutes are reabsorbed into the bloodstream, but water is unable to follow due to the impermeability of the membrane.
This creates a concentration gradient that allows for the production of urine with a specific osmolarity, which is necessary for maintaining proper fluid and electrolyte balance in the body.
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Does choanoflagellates have cell covering or skeleton. Give an explanation.
Answers
Yes, it is true that choanoflagellates have cell covering of skeleton.
What are some of the characteristics of choanoflagellates?Choanoflagellates are group of free-living unicellular and colonial flagellate eukaryotes that are the closest living relatives of the animals.
Choanoflagellates, was regarded as most closely related to animals because some of their tentacles (with a rigid internal skeleton of bundled actin as in animal intestinal microvilli) are aggregated as a collar surrounding the cilium.
Choanoflagellates have a distinct morphology which is characterized by spherical/ovoid shape and single flagellum that is surrounded by around 30-40 microvilli. They are between 3 and 10 µm in diameter.
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Explain how and why a drop of syrup can spread through the water in a beaker without stirring?
Answers
Answer:
The syrup drop spreads in water without stirring because particles of syrup separate water molecules and bump into it and dissolve.
Explanation:
Answer:
The syrup drop spreads in water without stirring because particles of syrup separate water molecules and bump into it and dissolve.
Explanation:
This is called diffusion. If you just leave the drop of syrup in the beaker for a while, it will eventually spread out around the beaker and all of the water will become sweet.
For example:
This is just like a restaurant, there is non-smoking half of the restaurant and there is a smoking half. The smoke will eventually spread out front he smoking corner to the non-smoking corner.
Another example:
If you pee in the pool, the pee will eventually spread out through the pool.
What is an example of positive feedback?
O A herd of buffalo running away after one of them spots a lion.
O A pressure cooker valve opening to reduce the high pressure inside.
O A computer screen dimming when the battery gets low.
O A thermostat switching on an air conditioner when the temperature gets too hot.(wrong)
Answers
.
which type of muscle would fatigue faster, one that has many blood vessels or one that has fewer blood vessels? explain.
Answers
Fewer blood vessels because it has lower oxygen capacity.
Arteries, veins, and capillaries are the three different types of blood vessels. Each of these contributes in a very particular way to the circulation process.
Away from the heart, arteries transport oxygenated blood. They have a hard exterior but a smooth internal layer of epithelial cells that promotes easy blood flow. A thick, muscular intermediate layer is also present in arteries, which aids in the movement of blood throughout the body. Veins and arteries are linked by capillaries. Blood that is rich in oxygen is transported from the arteries to the capillaries, where the actual exchange of oxygen and carbon dioxide takes place. The waste-rich blood is subsequently transferred through the capillaries to the veins, where it is then circulated back to the heart and lungs.
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