Which is a TRUE statement about smooth muscle?

A. Smooth muscle is striated.
B. Smooth muscle does not have thick and thin filaments.
C. Smooth muscle does not use troponin-tropomyosin to regulate cross-bridge activity.
D. Changes in cytosolic calcium do not regulate cross-bridge activity in smooth muscle.
E. The myosin in smooth muscle requires phosphorylation before it can bind to ATP.


C

Anatomy & Physiology

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