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What does nervous co-ordination require?

What are examples of effectors and receptors in complex organs?

What do nervous systems use for fast, short-lived responses?

What are hormones?

What does the development of nervous and hormonal communications systems depend on?

What are nervous systems made up of?

What do neurons transmit when stimulated?

What is an axon?

What are some axons surrounded by?

What is the central nervous system (CNS) made up of in humans?