PHYSIOLOGY
SLIDING FILAMENT MODEL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Ca2+ is stored here. It is released upon nerve stimulation at the beginning of the contraction and ATP puts it back after the contraction
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Sarcoplasm
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‘Sarcolemma
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Sarcoplasmic reticulum
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Sarcomere
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Explanation:
Detailed explanation-1: -A muscle action potential propagating along a transverse tubule opens Ca2+ release channels in the sarcoplasmic reticulum (SR), calcium ions flow into cytosol, and contraction begins. 3. Ca2+ binds to troponin, which changes the shape of the troponin-tropomyosin complex and uncovers the myosin-binding sites on actin.
Detailed explanation-2: -As a key regulator of cellular calcium homeostasis, the Sarcoendoplasmic Reticulum Calcium ATPase (SERCA) pump acts to transport calcium ions from the cytosol back to the sarcoplasmic reticulum (SR) following muscle contraction.
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