PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sarcolemma
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Sarcoplasmic Reticulum
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T-tubule
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Sarcomere
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Detailed explanation-1: -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-2: -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-3: -The part of the neuron that needs the calcium is very close to the surface of the neurons membrane, so thats where it needs to draw in calcium. The sarcoplasmic reticulum is deep within the muscle cell, cause thats where the troponin are that need the calcium.