The accompanying figure best represents what happens at a(n) _.
(Will be marked as Brainliest NO JOKE)
a. neuronal membrane
b. muscle fiber
c. negative feedback loop
d. neuromuscular junction
e. postsynaptic terminal

Option D: Neuromuscular junction

Explanation:

This is the site of transmission of chemical signal also known as a chemical synapse between a neuron and a muscle fibre. Most of the time the chemical released which is a neurotransmitter is acetylcholine. When released, it stimulates the release of calcuim ions present in the sarcoplasm: an endoplasm like structure in the muscle fiber that contains calcium ions.

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