Which ion is essential for muscle contraction | vedclass

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(C) Muscle contraction is initiated by a signal sent by the central nervous system via a motor neuron. When the action potential reaches the neuromusc

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$Ca^{++}$

Vedclass · Answer

(C) Muscle contraction is initiated by a signal 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 stimulates the sarcoplasmic reticulum to release calcium ions $(Ca^{++})$ into the sarcoplasm. These $Ca^{++}$ ions bind to the troponin subunit on the actin filaments,which causes a conformational change that exposes the active sites for myosin binding. Thus,$Ca^{++}$ is essential for the initiation of the cross-bridge cycle and muscle contraction.

Which ion is essential for muscle contraction?

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