Concept explainers
A.
To explain: The role of calcium in muscle contraction is to detach myosin heads from actin.
Introduction: Calcium ions play important role in the muscle contraction. The muscle contraction in skeletal muscles is initiated when the calcium ions bind to the troponin that is linked to the actin filament. Then, calcium ion induces a change in the configuration of the troponin complex. Thus, tropomyosin shifts from the actin filament to the myosin head that initiates contraction.
B.
To explain: The role of calcium in muscle contraction is to spread the actin potential from the plasma membrane to the contractile machinery.
Introduction: Calcium ions play important role in the muscle contraction. The muscle contraction in skeletal muscles is initiated when the calcium ions bind to the troponin that is linked to the actin filament. Then, calcium ion induces a change in the configuration of the troponin complex. Thus, tropomyosin shifts from the actin filament to the myosin head that initiates contraction.
C.
To explain: The role of calcium in muscle contraction is to expose actin filaments to myosin heads.
Introduction: Calcium ions play important role in the muscle contraction. The muscle contraction in skeletal muscles is initiated when the calcium ions bind to the troponin that is linked to the actin filament. Then, calcium ion induces a change in the configuration of the troponin complex. Thus, tropomyosin shifts from the actin filament to the myosin head that initiates contraction.
D.
To explain: The role of calcium in muscle contraction is to maintain the myosin filament structure.
Introduction: Calcium ions play an important role in the muscle contraction. The muscle contraction in skeletal muscles is initiated when the calcium ions bind to the troponin that is linked to the actin filament. Then, calcium ion induces a change in the configuration of the troponin complex; thus, tropomyosin shifts from the actin filament to the myosin head that initiates contraction.
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