Noun | 1. | ![]() anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical part of a living thing; "he has good bone structure" alpha receptor, alpha-adrenergic receptor, alpha-adrenoceptor - receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasoconstriction and relaxation of intestinal muscles and contraction of smooth muscles) beta receptor, beta-adrenergic receptor, beta-adrenoceptor - receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasodilation and increased heart beat) |
2. | ![]() lateral line, lateral line organ - sense organs of fish and amphibians; believed to detect pressure changes in the water organ - a fully differentiated structural and functional unit in an animal that is specialized for some particular function enteroceptor, interoceptor - any receptor that responds to stimuli inside the body exteroceptor - any receptor that responds to stimuli outside the body pineal eye, third eye - a sensory structure capable of light reception located on the dorsal side of the diencephalon in various reptiles baroreceptor - a sensory receptor that responds to pressure chemoreceptor - a sensory receptor that responds to chemical stimuli thermoreceptor - a sensory receptor that responds to heat and cold ear - the sense organ for hearing and equilibrium organ of hearing - the part of the ear that is responsible for sensations of sound inner ear, internal ear, labyrinth - a complex system of interconnecting cavities; concerned with hearing and equilibrium semicircular canal - one of three tube loops filled with fluid and in planes nearly at right angles with one another; concerned with equilibrium stretch receptor - a receptor in a muscle that responds to stretching of the muscle tissue papilla - a small nipple-shaped protuberance concerned with taste, touch, or smell; "the papillae of the tongue" sensory system - the body's system of sense organs effector - an organ (a gland or muscle) that becomes active in response to nerve impulses |