Question

Which is the neurotransmitter that causes the release of calcium ions from reservoirs within the muscle cell and thereby initiates the steps of contraction?

Answer 1

Step-by-step explanation:

Motor neurons release acetylcholine from synaptic vesicles to trigger muscle contraction. Motor neurons contain high concentration of synaptic vesicles filled with acetylcholine which is the neurotransmitter that triggers contraction of skeletal muscle cells.