MUSCLE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sodium
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Calcium
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Potassium
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Magnesium
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Detailed explanation-1: -Ca++ ions bind with a unit of troponin which is responsible for masking of active sites for myosin through tropomyosin.
Detailed explanation-2: -Contraction of heart muscle is driven by an interaction between myosin, actin and MgATP that is controlled on a beat-to-beat basis by transient binding of Ca2+ ions to the troponin/tropomyosin complex in the actin-containing thin filaments (Tobacman, 1996; Gordon et al.
Detailed explanation-3: -Answer and Explanation: In skeletal muscle contraction, calcium apparently acts to: C) remove the blocking action of tropomyosin. Once the motor endplate potential travels from the surface down the T-tubules towards the sarcoplasmic reticulum, it signals the calcium channels to open and release calcium into the cell.