Hi, I have a question about the physiology of high speed muscle contractions. Th

Question

Hi, I have a question about the physiology of high speed muscle contractions. There can be more than one correct answer on this problem:

Which of thefolowing are features that alow for high speed contractions by skelctal musce cells? contractions by skeletal muscle cells? O High and low affinity binding sites for calcium on troponin C such that two of the sites should already be bound to calcium for subsequent contractions The ready presence of ATP in the sarcoplasm Large myelinated nerve cells that stimulate muscle contraction Synaptic troughs at the motor end plate that contain large numbers of acetylcholine receptors Large amounts of acetylcholine released after the action potential in motor nerve cells Mechanical rotation of tropomyosin to expose the myosin binding site on actin High speed ATPase enzyme activity on the myosin heads High speed SERCA pumps in the sarcoplasmic reticulum A sarcoplasmic reticulum that contains a lot of excess calcium T-tubules that readily carry the action potential into the very large skeletal muscle cells

Explanation / Answer

There are multiple factors which effects high speed muscle contractions in skeletal muscle cells.

Lets understand those factors.

1) The excessive available presence of ATP in sarcoplasm.

2) Large amount of acetylcholine is released after action potential in motor nerve cells.

3) Large number of acetlycholine receptors at motor end plates.

4) High speed SERCA pumps in sarcplasmic reticulam.  

5) Sarcplasmic reticulam contains lot of excess calcium.

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