These questions are general concept questions I am having a hard time understand

Question

These questions are general concept questions I am having a hard time understanding the full concepts, regarding muscle contraction & the membrane potentials of such activity...

•What are the reasons for the latent period?

•What terminates the action potential?

•What terminates the muscle fiber contraction?

•Compare the roles of Ca2+ in the action potential and in the fiber contraction

•Can we explain qualitatively from energy conservation why shortening velocity decreases when the load increases?

•Why does contraction last longer than calcium elevation?

•Can you think of any analogy between tetanic contraction and an electric light bulb heated by AC?

•If only a few fibers in a muscle are activated, what do you think would happen to the rest of the fibers?

If you all could give your insight upon these questions I would greatly appreciate it!

Explanation / Answer

1) Latent period is an inactive period or saturated time, where there will be no change in the length of the muscle. The tension of the muscle fibers reaches to the peak point, which does not allow muscle to contract. This leads to muscle twitch.

2) The rapid influx of sodium ions across the electrochemical gradients slows channels to open maximally. This decreases the permeability to sodium channel in relation to potassium. This change in membrane potential leads to termination of action potential.

3)  Release of calcium ions from toponin docking site would terminate muslce contraction and becomes relaxed.

4) Calcium ion channles open due to depolarization of T tuble membrane but there will be an increase in the permeability of Calcium ions in sarcoplasmic reticulum.

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