Which of these compounds binds with the calcium that enters the cell during smooth muscle excitation

Question

Quizplus · Accepted Answer

Calmodulin is a calcium-binding protein that is responsible for regulating calcium-dependent processes in smooth muscle cells, including contraction. When calcium enters the cell during excitation, it binds to calmodulin and activates myosin light chain kinase, which ultimately leads to smooth muscle contraction. Troponin is a calcium-binding protein found in skeletal and cardiac muscle, but not smooth muscle. Myosin is a motor protein that is involved in muscle contraction, but it does not directly bind to calcium. Inactive myosin kinase is not a compound found in smooth muscle cells.

Which of These Compounds Binds with the Calcium That Enters