Which one of the following proteins is NOT involved in the active process of muscle contraction?
A. Myosin
B. Actin
C. Tropomyosin
D. Troponin
E. Titin
ANS: E
Rationale: Binding of Ca2+ with troponin causes tropomyosin to move, exposing active sites on actin for myosin to bind. When the heads of myosin swivel, the sarcomere actively contracts. Titin is a structural protein, not involved in active contraction.
Health & Biomechanics
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