Which Is a TRUE Statement About Smooth Muscle

Multiple Choice

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.