Which of the following is true regarding the action potential of skeletal muscle?
Depolarization of the muscle fibers is essential for initiating muscle contraction. The action potential of skeletal muscle is transmitted to all of the fibrils along T-tubules, triggering the release of Ca2+ from the lateral sacs of the sarcoplasmic reticulum next to the T-system. The electrical events in skeletal muscle and the ionic fluxes underlying them are similar to those in nerve. In contrast, the action potential in cardiac muscle is longer and has a prolonged plateau phase.
It spreads inward to all pas of the muscle the T-tubules
It has a prolonged plateau phase
It causes the immediate uptake of Ca2+ into the lateral sacs of the sarcoplasmic reticulum
It is longer than the action potential of cardiac muscle
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