PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What would be the correct order of the steps?Action potential travels down T-tubules. Nerve impulse reaches the muscle. Calcium binds to troponin. Tropomyosin moves.
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1, 2, 3, 4
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4, 3, 2, 1
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3, 4, 1, 2
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2, 1, 3, 4
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Explanation:
Detailed explanation-1: -An action potential has three phases: depolarization, overshoot, repolarization. There are two more states of the membrane potential related to the action potential. The first one is hypopolarization which precedes the depolarization, while the second one is hyperpolarization, which follows the repolarization.
Detailed explanation-2: -Depolarisation and calcium ion release. Actin and myosin cross-bridge formation. Sliding mechanism of actin and myosin filaments. Sarcomere shortening (muscle contraction)
Detailed explanation-3: -Ca++ pumped back in sarcoplasmic reticulum. release of Ca++ from troponin. cessation of interaction between actin and myosin.
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