noun.
A muscle, gland, or organ capable of responding to a stimulus, especially a nerve impulse.
noun.
A nerve ending that carries impulses to a muscle, gland, or organ and activates muscle contraction or glandular secretion.
noun.
A small molecule or protein that alters biochemical processes in a cell, as by decreasing or increasing the activity of an enzyme.
noun.
A device used to produce a desired change in an object in response to input.