PHYSIOLOGY
MUSCLE STRUCTURE FUNCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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sarcoplasm
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sarcoplasmic reticulum
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myolemma
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endomysium
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Detailed explanation-1: -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-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: -Inside the muscle fibre, the T-tubules lie next to the terminal cisternae of an internal membrane system derived from the endoplasmic reticulum, called the sarcoplasmic reticulum (SR), which is a store of calcium ions.
Detailed explanation-4: -Sarcoplasmic reticulum stores calcium ions and releases them into the sarcoplasm for the generation of action potential during muscle contraction. The binding of calcium ions to troponin removes the masking of active sites of myosin present on actin filaments.
Detailed explanation-5: -Abstract. Calcium storage is one of the functions commonly attributed to the endoplasmic reticulum (ER) in nonmuscle cells.