A : Ca^{2+} plays an important role in muscle | vedclass

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(A) $Ca^{2+}$ ions play a crucial role in muscle contraction. When $Ca^{2+}$ is released into the sarcoplasm,it binds to the $TpC$ subunit of troponin

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) $Ca^{2+}$ ions play a crucial role in muscle contraction. When $Ca^{2+}$ is released into the sarcoplasm,it binds to the $TpC$ subunit of troponin. This binding induces a conformational change in the troponin complex,which in turn displaces tropomyosin from the active sites on the actin filament. This exposure allows the myosin heads to bind to the actin,forming an actomyosin complex,which initiates the contraction process.

$A : Ca^{2+}$ plays an important role in muscle contraction.
$R : Ca^{2+}$ combines with the troponin chain,displacing tropomyosin and allowing the myosin head to combine with actin to form an actomyosin complex.

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$A : Ca^{2+}$ plays an important role in muscle contraction.$R : Ca^{2+}$ combines with the troponin chain,displacing tropomyosin and allowing the myosin head to combine with actin to form an actomyosin complex.