In a muscle contraction,what specifically is the role of calcium?
A) it causes the hydrolysis of ATP
B) it connects actin with myosin to form a cross-bridge
C) it causes the uncovering of the myosin binding site on actin
D) it catalyzes the formation of ATP from ADP and Pi
E) it causes the release of Pi from the myosin head

Question

Quizplus · Accepted Answer

Calcium binds to troponin, causing a conformational change that moves tropomyosin away from the myosin binding site on actin, thus allowing the myosin head to bind to actin and form a crossbridge. This initiates the sliding of actin filaments by myosin and results in muscle contraction.

In a Muscle Contraction,what Specifically Is the Role of Calcium