In a muscle contraction event,what causes the release of calcium from its endoplasmic reticulum?
A) the hydrolysis of ATP
B) the formation of ATP
C) the formation of the actin-myosin cross-bridge
D) a signal from a motor neuron
E) the shortening of the sarcomere

Question

Quizplus · Accepted Answer

The release of calcium from the endoplasmic reticulum (sarcoplasmic reticulum in muscle cells) is triggered by a signal from a motor neuron, which causes the release of acetylcholine at the neuromuscular junction. The acetylcholine binds to receptors on the muscle cell membrane, leading to depolarization of the membrane and the initiation of an action potential that spreads into the interior of the muscle cell. This action potential triggers the release of calcium from the sarcoplasmic reticulum and the subsequent events of muscle contraction.

In a Muscle Contraction Event,what Causes the Release of Calcium