PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What part of the muscle fiber stores Ca ions and releases them when stimulated?
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T tubule
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Sarcolemma
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Nucleus
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Sarcoplasmic reticulum
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Explanation:
Detailed explanation-1: -When the muscle is stimulated, calcium ions are released from its store inside the sarcoplasm ic reticulum, into the sarcoplasm (muscle ). Invaginations of the plasma membrane (sarcolemma) of the muscle fibres are called T (or transverse) tubules .
Detailed explanation-2: -Calcium ions at rest are stored in the sarcoplasmic reticulum (SR) from which they are rapidly released upon the depolarisation of the sarcolemmal and transverse (T-) tubular membranes of the muscle cell.
Detailed explanation-3: -The sarcoplasmic reticulum releases calcium ions during muscle contraction and absorb them during relaxation.
There is 1 question to complete.