Neurons - The human nervous system is made of special cells called neurons.
- Figure 12.2 illustrates a particular type of neurone called a motor neurone.
- Neurones contain the same basic parts as any animal cell.
- Each has a nucleus , cytoplasm and a cell membrane .
- However, their structure is specially adapted to be able to carry electrical signals very quickly.
- To enable them to do this, they have long, this fibres of cytoplasm stretching out from the cell body.
- The longest fibre in a neurone is called an axon.
- Axons can be more than a metre long. The shorter fibres are called dendrites.
- The dendrites pick up electrical signals from other neurons lying nearby.
- These signals are called nerve impluses.
- The signals passes to the cell body, then along the axon, which might pass it to another neurone.
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