During the mechanism of muscle contraction,Ca | vedclass

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(A) During muscle contraction,the signal for contraction is sent by the central nervous system via a motor neuron. When the action potential reaches t

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Troponin

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(A) During muscle contraction,the signal for contraction is sent by the central nervous system via a motor neuron. When the action potential reaches the neuromuscular junction,it triggers the release of neurotransmitters,leading to an action potential in the sarcolemma. This action potential spreads through the $T$-tubules and causes the release of $Ca^{2+}$ ions into the sarcoplasm from the sarcoplasmic reticulum. These $Ca^{2+}$ ions bind to the $Troponin$ subunit on the actin filaments. This binding causes a conformational change in the troponin-tropomyosin complex,exposing the active sites on the $F$-actin filaments for the myosin heads to bind,thereby initiating contraction.

During the mechanism of muscle contraction,$Ca^{2+}$ binds with which of the following?

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