PHYSIOLOGY
NEUROMUSCULAR JUNCTION TRANSMISSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What two chemicals are necessary to initiate muscle contraction according to the “Sliding Filament” theory?
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Sodium and Potassium
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Acetylcholine and Potassium
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Calcium and ATP
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Niacin and Potassium
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Explanation:
Detailed explanation-1: -The increased Ca2+ concentration signals muscle contraction via the action of two accessory proteins bound to the actin filaments: tropomyosin and troponin (Figure 11.25).
Detailed explanation-2: -According to the sliding filament theory, the myosin (thick filaments) of muscle fibers slide past the actin (thin filaments) during muscle contraction, while the two groups of filaments remain at relatively constant length.
Detailed explanation-3: -What chemical ATP or Ca2+ triggers sliding of the muscle filaments? Calcium ions trigger the sliding of the myofilaments.
There is 1 question to complete.