PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The last step of phase 2 of a muscle contraction, where myosin attaches to actin, is the same as the first step of phase 3 of a muscle contraction.
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True
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False
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -Depolarisation and calcium ion release. Actin and myosin cross-bridge formation. Sliding mechanism of actin and myosin filaments. Sarcomere shortening (muscle contraction)
Detailed explanation-2: -Ca++ pumped back in sarcoplasmic reticulum. release of Ca++ from troponin. cessation of interaction between actin and myosin.
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