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.

Question

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.

Quizplus · Accepted Answer

Smooth muscle uses a different mechanism from striated muscle for contraction regulation, involving the phosphorylation of myosin light chain rather than the troponin-tropomyosin complex to control cross-bridge activity.

Which Is a TRUE Statement About Smooth Muscle