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slega [8]
3 years ago
14

Why do the different skeletal muscle fiber types vary in the speed and duration of their twitches?

Medicine
1 answer:
IrinaVladis [17]3 years ago
5 0

Answer:

The different skeletal muscle fiber types vary in the speed and duration of their twitches due to -

b) They vary in the rate of hydrolysis of ATP

c) They vary in the removal of Ca+ from the cytosol

Explanation:

There are mainly two types of muscle fibers , i.e.

a) slow twitching, long contraction duration( type I fibers)

b) First twitching but short duration of contraction. ( type II fibers).

Now think of the physiology of muscle. Two components are important, cytosolic Ca++ concentration and Availability of ATP. K+ is related to the action potential ( none or all law, there is no relation to the duration with respect to the potassium). For long contraction muscle fibers need a more steady supply of ATP, and also consistent high concentration of cytosolic Ca++ for muscle contraction to happen. So, these two factor is important for the duration of twitching. So the answer is option f .

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The action the nurse should include in the client's plan of care who is receiving tamoxifen (nolvadex) for the treatment of breast cancer is to help the client cope with hot flashes

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What type of structure in nerve cells must grow in order for sensory information to be relayed to the spinal cord?
larisa86 [58]

For sensory information to be relayed the nerve cells should have an axon.

<u>Explanation</u>:

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  • The axon is a long fiber that is covered by a protective layer called myelin sheath. It is this structure of the nerve cell or neuron that helps transmit signals to the Central Nervous System of which the spinal cord is a part.

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What is the difference between extrinsic muscles and intrinsic muscles?
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Read 2 more answers
The primitive streak appears during
solniwko [45]

Answer:

Gastrulation.

Explanation:

The embryonic development occurs through the different developmental stages like cleavage, morula, blastula and so on. The formation of the germ layers occur in the gastrulation period.

The primitive streak is the structure that develops during the early stages of the gastrulation. As the embryo becomes asymmetric., the cells moves from their initial position and leads to the formation of primitive streak in the gastrulation phase.

Thus, the correct answer is option (C).

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