Question

which is a true statement about smooth muscle? multiple choice smooth muscle is striated. smooth muscle does not have thick and thin filaments. smooth muscle does not use troponin - tropomyosin to regulate cross - bridge activity. changes in cytosolic calcium do not regulate cross - bridge activity in smooth muscle. the myosin in smooth muscle requires phosphorylation before it can bind to atp.

Explanation:

Smooth muscle is non - striated and has thick and thin filaments. Cross - bridge activity in smooth muscle is regulated by cytosolic calcium but not through the troponin - tropomyosin complex like in skeletal muscle. Myosin in smooth muscle binds to actin after phosphorylation, not ATP.

Answer:

Smooth muscle does not use troponin - tropomyosin to regulate cross - bridge activity.