PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Actin is the ____
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Thick Filament within a Muscle Fibre
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Thin Filament within a Muscle Fibre
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Protein that covers myosin-binding sites
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Molecule that causes muscle contraction
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Explanation:
Detailed explanation-1: -Actin is the thin filaments of the muscles. They are a polymer of G-actin monomers arranged in chains and two such chains are wound in a helix. So, the given statement is true.
Detailed explanation-2: -Actin is the principal protein component of the sarcomeric thin filaments.
Detailed explanation-3: -As discussed later, the motor activity of myosin moves its head groups along the actin filament in the direction of the plus end. This movement slides the actin filaments from both sides of the sarcomere toward the M line, shortening the sarcomere and resulting in muscle contraction.
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