객관식
What causes the release of calcium ions into the sarcoplasm from the terminal cisterns during muscle contraction?
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9. Muscle Tissue
Sliding Filament Theory and the Sarcomere
객관식
What is the consequence if the myosin heads cannot bind to the actin during muscle contraction?
A
Muscle contraction will not occur.
B
The sarcomere will shorten.
C
ATP will not be hydrolyzed.
D
Calcium ions will not be released from the sarcoplasmic reticulum.
검증된 단계별 안내1
Understand the role of myosin and actin in muscle contraction: Myosin heads bind to actin filaments to form cross-bridges, which are essential for muscle contraction.
Recognize the importance of calcium ions: Calcium ions bind to troponin, causing a conformational change that moves tropomyosin away from the binding sites on actin, allowing myosin heads to attach.
Consider the role of ATP: ATP is necessary for the myosin heads to detach from actin and re-cock for another cycle of binding and pulling, which is crucial for muscle contraction.
Analyze the consequence of myosin heads not binding to actin: If myosin heads cannot bind to actin, cross-bridge formation does not occur, preventing muscle contraction.
Evaluate the impact on the sarcomere and ATP: Without cross-bridge cycling, the sarcomere will not shorten, and ATP will not be hydrolyzed as there is no detachment and re-cocking of myosin heads.
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