effector

noun

1. Also effecter. a person or thing that effects.
2. Physiology. an organ or cell that carries out a response to a nerve impulse.
3. Biochemistry. a substance, as a hormone, that increases or decreases the activity of an enzyme.

noun

1. physiol a nerve ending that terminates in a muscle or gland and provides neural stimulation causing contraction or secretion

n.

1. A muscle, gland, or organ capable of responding to a stimulus, especially a nerve impulse.
2. A nerve ending that carries impulses to a muscle, gland, or organ and activates muscle contraction or glandular secretion.