PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What ions are released from the Sarcoplasmic Reticulum during the second phase of a muscle contraction?
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Calcium
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Potassium
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Sodium
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Phophorus
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Explanation:
Detailed explanation-1: -Ca2+ ions trigger muscle contraction and the release of Ca2+ from the sarcoplasmic reticulum (the intracellular Ca2+ storage site) plays an important role in determining the intramuscular Ca2+ concentration.
Detailed explanation-2: -Depolarization of the sarcolemma (muscle membrane) caused by nerve stimulation causes calcium ions to be released from the sarcoplasmic reticulum.
Detailed explanation-3: -Calcium ions are stored inside the sarcoplasmic reticulum. When an action potential arrives, calcium ions are released from the sarcoplasmic reticulum into the sarcoplasm around the thick and thin filaments.
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