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Which organ system carries messages around the body?

Nervous system - Nerve Cells and Nerves

Function: To transmit messages from one part of your body to another

Neurons: Messenger cells in your nervous system

Nerve impulses: Electrical signals carrying messages

Neurotransmitters: Chemicals released by one neuron to excite a neighbouring one
Millions of messengers
Your nervous system contains millions of nerve cells, called neurons. Neurons are highly specialised to transmit messages from one part of your body to another.

All neurons have a cell body and one or more fibres. These fibres vary in length from microscopic to over 1 metre. There are two different kinds of nerve fibres: fibres that carry information towards the cell body, called dendrites, and fibres that carry information away from it, called axons. Nerves are tight bundles of nerve fibres.