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Which of the following events does not occur during the depolarization phase of a skeletal muscle...

Which of the following events does not occur during the depolarization phase of a skeletal muscle action potential?

A. T-tubules depolarize

B. troponin changes shape, moving tropomyosin off of actin's myosin binding sites

C. Ca++ is released from the sarcoplasmic reticulum

D. Ca++ channels in the axon terminal open

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Answer #1

Answer

The event that does not occur during the depolarization phase of a skeletal muscle action potential is :

  • Ca++ channels in the axon terminal open


- After sarcolemma depolarizes due to influx of sodium ion, action potential is carried down by the T tubules.
- Depolarization of T-tubules causes opening of Ca2+ channels in the sarcoplasmic reticulum.
- Calcium ions are released from sarcoplasmic reticulum into the sarcoplasm.
- Calcium binds to the troponin and changes its shape, moving tropomyosin off of actin's myosin binding sites.


- Calcium channels in axon terminal open when nerve impulse reaches axon terminal or pre-synaptic neuron. This event is not included in depolarization phase of skeletal muscle.

Option D

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