PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Actin and myosin filaments condense, thus causing the filament to shorten which in turn shortens the muscle
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Myosin rotates and wraps actin around it making the muscle shorter
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Friction is reduced between thin and thick filaments causing the thick filaments to move inside the thin
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Actin filaments slide over myosin filaments, making the muscle shorter
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Detailed explanation-1: -Sliding-filament model of muscle contraction. The actin filaments slide past the myosin filaments toward the middle of the sarcomere. The result is shortening of the sarcomere without any change in filament length.
Detailed explanation-2: -The sliding filament theory explains the process of muscle contraction during which the thin filaments slide over the thick filaments, which shortens the myofibril. Each muscle fibre has an alternate light and dark band, which contains a special contractile protein, called actin and myosin respectively.
Detailed explanation-3: -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.