Question

Peptide neurotransmitters are often released:

a. together with nonpeptide transmitters.
b. as propeptides.
c. more readily and quickly than nonpeptide transmitters.
d. shortly after their synthesis in presynaptic terminals.
e. as pre-propeptides.

Answer 1

Peptide neurotransmitters are typically released along with nonpeptide transmitters. They consist of amino acid chains and can function as neurotransmitters at synapses and as hormones in the body.

Step-by-step explanation:

Peptide neurotransmitters are often released together with nonpeptide transmitters. They are composed of chains of amino acids connected by peptide bonds and can range in size from very short, like met-enkephalin with five amino acids, to longer chains such as beta-endorphin which has 31 amino acids. These neuropeptides not only function as neurotransmitters at the synapse, often co-released with other neurotransmitter types like amino acids, but they can also act as hormones in various systems throughout the body.