Which molecule contains a binding site for the attachment of myosin heads?

Name: Which molecule contains a binding site for the attachment of myosin heads?
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Question

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The molecule that contains a binding site for the attachment of myosin heads is actin. Myosin heads bind to specific binding sites on actin molecules during muscle contraction. The other options given (sarcoplasmic reticulum, ATP, and calcium) all play important roles in muscle contraction but do not contain specific binding sites for myosin heads.

Which Molecule Contains a Binding Site for the Attachment of Myosin