Moderate
The skeletal muscle action potential______________?
Correct answer: C. Spreads in ward to all parts of the muscle via the t- tubule system
- A. Is not essential for contraction to occur
- B. Has a prolonged plateau phase?
- C. Spreads in ward to all parts of the muscle via the t- tubule system
- D. Begins with an, in ward movement of K+ ins
Explanation
The skeletal-muscle action potential travels along the sarcolemma and deep into the fibre through the transverse tubules, allowing nearly simultaneous activation of the myofibrils. It has no prolonged plateau, and its upstroke is due mainly to inward sodium movement, not potassium.
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