Question

Which process must occur for a muscle to be able to relax?

ОА. .
The amount of ATP in the neuromuscular junction must increase.
OB. Myosin and actin must attach to each other.
OC.
A nerve must initiate an action potential in the muscle fiber.
OD
The concentration of calcium in the myofibril must decrease.

Answer 1

D. The concentration of calcium in the myofibril must decrease.