Lesson 3 of 4 · Form 4 Biology
Reception, response and coordination
18 min
The nervous system
- Central nervous system (CNS): brain and spinal cord.
- Peripheral nervous system: nerves linking the CNS to the body.
Types of neurones
- Sensory: carries impulses from receptors to the CNS.
- Relay (intermediate): in the CNS, links sensory and motor neurones.
- Motor: carries impulses from the CNS to effectors (muscles, glands).
Reflex arc
Stimulus → receptor → sensory neurone → relay neurone (spinal cord) → motor neurone → effector → response
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