In a muscle contraction, calcium ____.
A) causes the hydrolysis of ATP
B) connects actin with myosin to form a cross-bridge
C) allows myosin to bind to actin
D) catalyzes the formation of ATP from ADP and Pi
E) causes the release of Pi from the myosin head

Question

​In a muscle contraction, calcium ____.
A) ​causes the hydrolysis of ATP
B) ​connects actin with myosin to form a cross-bridge
C) ​allows myosin to bind to actin
D) ​catalyzes the formation of ATP from ADP and Pi
E) ​causes the release of Pi from the myosin head

Quizplus · Accepted Answer

Calcium ions bind to troponin, which causes a conformational change that moves tropomyosin away from the myosin-binding sites on actin filaments. This exposure allows myosin heads to bind to actin, facilitating muscle contraction.

​In a Muscle Contraction, Calcium ____

In a Muscle Contraction, Calcium ____