Biology Unit 1: Nervous System and Hormones
- Created by: sydneyks
- Created on: 04-03-14 16:44
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Nervous System
Internal Control
-The nervous system enables humans to react to their surroundings and coordinate their behaviour.
- Information from receptors pass along cells called neurones in nerves to the brain.
- Nerver impulses are electrical signals.
Steps Reflexs are the same but go to a relay neurone not CNS (quicker).
1. Stimuli
2. Receptor
3. Sensory neurone
4. Central nervous system
5. Motor neurone
6. Effector
Synapse
When an impulse reaches the end one of the neurones, it causes a chemical to be released called a neuronetransmitter which defuses across the gap and stimulates the impulse to continue in the next neurone.
Reflex …
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