PHYSIOLOGY
SARCOMERE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The crossbridges involved in muscle contraction are located on the ____
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myosin filaments
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actin filaments
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tropomyosin
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troponin
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Explanation:
Detailed explanation-1: -The myosin heads are known as cross-bridges because they can bind to and move along actin in the thin filament . It is this actin-myosin interaction that is the molecular basis for force generation and movement in muscle cells.
Detailed explanation-2: -Cross-bridges at various angles are seen between the thick and thin filaments binding in the actin target zones at 38.7-nm axial intervals on the thin filaments. Some cross-bridges are also seen binding in between the target zones.
Detailed explanation-3: -Force generation in the muscle sarcomere is driven by the head domain of the myosin molecule extending from the thick filament to form cross-bridges with the actin-containing thin filament.
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