Question

________ are short chains of amino acids.

A.) Neuropeptides
B.) Excitation-Contraction Coupling
C.) Neurotransmitters
D.) Adrenergic Receptors

Answer 1

Neuropeptides are short chains of amino acids functioning as neurotransmitters; examples include met-enkephalin and beta-endorphin. They can also act as hormones, like VIP and substance P.

Step-by-step explanation:

Neuropeptides are short chains of amino acids that serve as neurotransmitters. They vary in length with some being quite short, such as met-enkephalin which consists of only five amino acids. In contrast, others like beta-endorphin are longer, comprising 31 amino acids.

Neuropeptides can be released alongside other neurotransmitters at synapses and may also function as hormones in different bodily systems. One example of a neuropeptide that acts as a hormone in other systems is the vasoactive intestinal peptide (VIP), as well as substance P.