understand that stimulation of receptors in the sense organs sends electrical impulses along nerves into and out of the central nervous system, resulting in rapid responses
neurons:
-nerves have cell membranes, cytoplasm, and nucleus but are a different shape to other cells
-part of the cell is stretched to form the axon.
-the axon can be many meters long
how nerve messages travel
- the messages that nerves carry are sent by nerve impulses, which are electrical
- as a result of this the message travels very fast through the axon
some axons (such as mammals') have fatty sheaths around them that make the nerve impulses travel faster since the fat insulates the axon and makes the impulse travel faster
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