PHYSIOLOGY
MICROSCOPIC MUSCLE ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What feature of skeletal muscles “link the thick and thin filaments together during contraction”?
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myosin
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actin
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cross bridges
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sarcomeres
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Explanation:
Detailed explanation-1: -Muscle contraction is driven at the molecular level by a structural working stroke in the head domain of the myosin cross-bridge linking the thick and thin filaments.
Detailed explanation-2: -In the context of muscular contraction, a cross-bridge refers to the attachment of myosin with actin within the muscle cell. All muscle types-whether we’re talking about skeletal, cardiac, or smooth-contract by cross-bridge cycling-that is, repeated attachment of actin and myosin within the cell.
Detailed explanation-3: -A cross-bridge forms between actin and the myosin heads triggering contraction.
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