Which statement is true regarding muscle contraction?

A. Actin is the protein on the thin filament that binds to tropomyosin.
B. The thin filament is composed of the myosin protein.
C. The sarcoplasmic reticulum stores the sodium ions that are released with contraction.
D. Calcium ions bind to the troponin protein.

Question 23

The true statement about muscle contraction is that calcium ions bind to the troponin protein, leading to the exposure of myosin-binding sites on actin filament.

Explanation:

Calcium ions bind to the troponin protein is the true statement regarding muscle contraction. When calcium ions bind to troponin, it causes tropomyosin to shift its position on the actin filament, exposing the myosin-binding sites for muscle contraction. This process is essential for the interaction between actin and myosin during muscle contraction.

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