1) What is a receptor? 2) What is a stimulus? 3) What is an effector? 4) What are neurones? 5) What is the nervous system made up of? 6) What is the PNS and what does it include? 7) What is the CNS and what does it include? 8) How many different types of neurones are there? 9) Where are relay neurones located? 10) Give one differentiation of a sensory neurone. 11) What cell produces the myeline sheath around the axon? 12) What is a synapse? 13) What do neurotransmitters do? 14) Why are neurotransmitters recycled and destroyed? 15) Why impulses across a synapse only travel in one direction? 16) Why is it that drugs only affect the nervous system at the synapses?

Nervous system

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