Which is the neurotransmitter that causes the release of calcium ions and initiates the steps of skeletal muscle fiber contraction?
A)Acetylcholinesterase
B)Acetylcholine
C)Serotonin
D)Norepinephrine

Question

Quizplus · Accepted Answer

Acetylcholine is the neurotransmitter that is released at the neuromuscular junction and binds to receptors on the muscle fiber. This binding causes the release of calcium ions from the sarcoplasmic reticulum, which initiates the steps of muscle fiber contraction. Acetylcholinesterase is an enzyme that breaks down acetylcholine after it has been released to stop the muscle contraction. Serotonin and norepinephrine are neurotransmitters that have different functions in the body and are not involved in skeletal muscle fiber contraction.

Which Is the Neurotransmitter That Causes the Release of Calcium