an organ (a gland or muscle) that becomes active in response to nerve impulses | an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation |
a nerve fiber that terminates on a muscle or gland and stimulates contraction or secretion | a cellular structure that is postulated to exist in order to mediate between a chemical agent that acts on nervous tissue and the physiological response |
one who brings about a result or event; one who accomplishes a purpose | |