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the part of the brain that controls voluntary muscle movement and regulkates balance and posture.
peripheral nervous system
system made of sensory and motor neurons that transmit information between the central nervous system and the rest of the body.
an area at the back of the eye that includes two types of cells-rod cells and cone cells-that contain photoreceptors.
system consisting groups of organs and tissues that release chemical messages into the blood stream.
a chemical signal that is produced by an endocrine gland in one part of an organism and carried in the bloodstream to another part of the organism.
a control system in which the effect of a hormone inhibits further release of the hormone: sends signal to stop a response.
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