Name the ion responsible for unmasking of act | vedclass

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(A) During muscle contraction,the signal for contraction is initiated by an action potential that travels along the sarcolemma and reaches the sarcopl

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Calcium

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(A) During muscle contraction,the signal for contraction is initiated by an action potential that travels along the sarcolemma and reaches the sarcoplasmic reticulum. This triggers the release of $Ca^{2+}$ ions into the sarcoplasm. These $Ca^{2+}$ ions bind to the troponin complex 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 actin filament. By unmasking these active sites,the myosin heads can bind to actin 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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