reflex action, A quick automatic response to a stimulus without conscious thought., Nervous System, The body system that controls and coordinates actions and responses., neurone, A nerve cell that carries electrical impulses through the body., reflect arc, The pathway followed by impulses during a reflex action, synapse , The small gap between two neurones, neurotransmitters , A chemical that carries signals across a synapse, eye , The sense organ responsible for vision, skin, The sense organ that detects touch, pressure, pain, and temperature, hormone, A chemical messenger carried in the blood, endocrine gland, A gland that secretes hormones directly into the bloodstream, homeostasis , The maintenance of a constant internal environment, peripheral nervous system, The nerves outside the brain and spinal cord, central nervous system, The part of the nervous system made up of the brain and spinal cord.

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