STIMULUS:
A stimulus is felt by an organism's senses which are sensitive parts of his physiology. ... When any part of an organism or of MAN's sensory organs is stimulated, a reaction or a response will result
........................................................................
RESPONSE:
A response is the behavior that is manifested by a LIVING organism which is the result of an external or internal stimulus.
........................................................................
AFFERENT:
Afferents to a given brain area are connections that bring signals into it.
........................................................................
EFFERENT:
efferents are connections that carry signals out of it.
........................................................................
CENTRAL NERVOUS SYSTEM:
The central nervous system or the CNS contains the brain and the spinal cord.
........................................................................
PERIPHERAL NERVOUS SYSTEM:
The peripheral nervous system or PNS contains the nerves, which leave the brain and the spinal cord and travel to certain areas of the body.
........................................................................
RECEPTOR:
a receptor is stimulated, it sends a signal along the nerve cells (called neurones) to the central nervous system. (SEE DIAGRAM to the left.) Usually, the brain - which is part of the nervous system - coordinates a response.
........................................................................
EFFECTOR:
Aneffector is any part of the body that produces the response.
........................................................................