The nervous system and reflex arc, the eye, and hormonal coordination including a comparison of the two systems.
The nervous system
Made of the central nervous system (brain and spinal cord) and nerves. Receptors detect stimuli; impulses travel along neurones to effectors (muscles/glands).
A reflex arc gives a fast, automatic response: receptor → sensory neurone → relay neurone (CNS) → motor neurone → effector. A synapse is a gap between neurones where a chemical neurotransmitter carries the signal across.
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