Stimulus - A change in the internal/external environment, Receptor cells - These detect stimuli, Effectors - Bring about change normally muscles in the nervous system, Reflex - Unthinking action in the nervous system, Central nervous system - Brain + spinal cord , Sensory neurones - These carry signals to the CNS from receptors, Motor neurones - These carry signals to the muscles from the CNS, Relay neurone - These join sensory to motor neurones , Dendrites - Branches that convert chemical messages into electrical signals, Synapse - Gap between neurones., Neurotransmitters - Chemicals released at synapses to continue the signal, Myelin sheath - Provides insulation (an adaptation of nerve cells)),

FFynone House: AQA biology: Homeostasis- nervous system definitions

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