Calcium is important in skeletal muscle contr | vedclass

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(B) During skeletal muscle contraction,the binding of $Ca^{2+}$ ions to the $Troponin$ complex is a critical step.In a relaxed state,the active sites

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Binds to troponin to remove the masking of active sites on actin.

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(B) During skeletal muscle contraction,the binding of $Ca^{2+}$ ions to the $Troponin$ complex is a critical step.In a relaxed state,the active sites on the actin filament are masked by the $Tropomyosin$ protein.When $Ca^{2+}$ ions are released from the sarcoplasmic reticulum,they bind to $Troponin$.This binding causes a conformational change in the $Troponin-Tropomyosin$ complex,which shifts the $Tropomyosin$ away from the active sites on the actin filament.This exposure allows the myosin heads to bind to the actin,forming cross-bridges and initiating muscle contraction.

Calcium is important in skeletal muscle contraction because it

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