What is meant by receptors and effectors? Give two examples of each.

A receptor is an organ or cell able to respond to heat, light or other external stimulus and transmit a signal to a sensory nerve. Example: Photoreceptor (a receptor which detects light) and phonoreceptor (a receptor which detects sound).

An effector is a muscle, gland or an organ capable of responding to a stimulus, especially a nerve impulse.


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