central nervous system CNS, processes nervous impulses from the body and coordiantes nerves, peripheral nervous system PNS, connects the central nervous system to other parts of the body, neurones, A nerve cell that carries electrical impulses., sensory neurones, neurones that connect sense organs to the central nervous system, relay neurones, neurones within the central nervous system, may be very short, motor neurones, neurones that connect the central nervous system to an effector: muscle, reflex actions, the simplest type of response to a stimulus, rapid, automatic and protects you., reflex arc , the pathway of neurones that an electrical impulse follows during a reflex response, eye, The sense organ that responds to changes in light., Synapse, the junction between two neurones, Neurotransmitters, molecules that can cross the synaptic gap between two neurones, Hormones, chemical menssagers used in the hormonal system, each of them has a different task , endocrine gland, organ that produce the hormones, homeostasis, the mantainance of a constant internal environment, sense organs , structures that contain different specialized receptor cells that respond to different specific stimuli.

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