PHYSIOLOGY
MICROSCOPIC MUSCLE ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The ____ functions in storage and regulation of Ca2+ levels.
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Sarcoplasmic Reticulum
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T Tubules
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Mitochondria
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Fascicle
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Explanation:
Detailed explanation-1: -Skeletal muscle function is governed by an action potential that releases calcium stored in the sarcoplasmic reticulum. This calcium then binds to tropomyosin and allows for the interaction of myosin and actin in the sarcomere, leading to muscle contraction.
Detailed explanation-2: -The sarcoplasmic reticulum (SR) is a specialized form of the endoplasmic reticulum of muscle cells, dedicated to calcium ion (Ca2+) handling, necessary for muscle contraction and relaxation.
Detailed explanation-3: -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.
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