Question

multiple choice question
the globular actin proteins that make up thin filaments in a myofibril have binding sites for

○ calcium
○ titin
○ t tubules
○ myosin

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Explanation:

In muscle contraction, myosin heads bind to the binding - sites on globular actin proteins of thin filaments in a myofibril. Calcium binds to troponin, titin is a large elastic protein, and T - tubules are involved in the electrical conduction in muscle cells but do not bind to actin in the way myosin does.

Answer:

D. myosin