The nervous system, reflex arcs, the eye, hormones, and tropisms in plants.
The nervous system
The nervous system is the central nervous system (brain + spinal cord) and the peripheral nerves. Three neurone types: sensory (receptor → CNS), relay (within CNS) and motor (CNS → effector). Electrical impulses travel along neurones; at a synapse a chemical (neurotransmitter) carries the signal across the gap to the next neurone.
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