Name the ion responsible for unmasking of act | vedclass

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(A) During muscle contraction,the $Ca^{2+}$ ions play a critical role.When a signal from the motor neuron reaches the muscle fiber,$Ca^{2+}$ ions are

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Calcium

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(A) During muscle contraction,the $Ca^{2+}$ ions play a critical role.When a signal from the motor neuron reaches the muscle fiber,$Ca^{2+}$ ions are released into the sarcoplasm.These $Ca^{2+}$ ions bind to the $Troponin$ subunit on the actin filaments.This binding causes a conformational change in the $Troponin-Tropomyosin$ complex,which shifts the $Tropomyosin$ away from the active sites on the $F-actin$ filaments.By unmasking these active sites,the $Myosin$ heads can bind to them to form cross-bridges,leading to muscle contraction.

Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

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