What you'll learn
How the nervous system coordinates responses.
Key ideas
- Neurones, synapses and the central nervous system.
- The reflex arc: receptor → sensory → relay → motor → effector.
Exam tips
- Learn the reflex arc order.
- Explain how signals cross a synapse.
Common mistakes
- Confusing sensory and motor neurones.
- Missing a stage of the reflex arc.