Question

Which excitatory neurotransmitter is involved in the transmission of neuromuscular junctions?
A) Epinephrine
B) Serotonin
C) Acetylcholine
D) Glycine

Answer 1

Hint:Neurotransmitters can be defined as the chemical substance which has been released at the end of one nerve fibre on arrival of a nerve impulse and diffuses across the synapse or the junction.

Complete answer:
Before we find the correct answer, let us first understand what neurotransmitter is and its types.
Neurotransmitters can also be called as the body's chemical messengers as they transmit signals from one neuron to another neuron or from neurons to muscles. There are three major types of neurotransmitters,
>Modulatory neurotransmitters
>Excitatory neurotransmitters
>Inhibitory neurotransmitters

Option A: Though epinephrine is an example of excitatory neurotransmitter it is not involved in transmission of neuromuscular junctions. Instead it helps in communication between the neurons. Therefore, this is the incorrect option.
Option B: Serotonin is an example of inhibitory neurotransmitters and not excitatory neurotransmitters. Therefore, this is the incorrect option.
Option C: Acetylcholine is an example of excitatory neurotransmitter which is released by the motor neurons It is released at synapses with muscle cells which are generally known as neuromuscular junctions. They are synthesized in the cytosol of the presynaptic axon terminal and stored in the synaptic vesicles.
Option D: Glycine is an example of inhibitory neurotransmitters and not excitatory neurotransmitters. Therefore, this is the incorrect option.

Thus, the correct option is (C) Acetylcholine.

Note:The function of acetylcholine are as follows,
>It is a part of the autonomic nervous system
>It helps in contraction of smooth muscles
>It increases bodily secretions
>It dilates the blood vessels
>It decreases the heart rate