Science- the nervous system
Mind map on the nervous system to revise from.
- Created by: Georgie
- Created on: 29-10-12 11:33
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- The Nervous system
- Recptors: A group of specialised cells that can detect changes in the enviroment- Stimuli
- Eyes-light
- Nose- Chemiacls in air
- Skin- Touch, Pressure, Pain and temperature
- Tounge- Chemicals in food
- Ears- Sound and position of head
- Neurones: nerve cells that carry information as tiny electrical signals.
- Sensory neurones- carry signals from receptors to the spinal cord and brain
- Relay neurones- carry messages from one part of thje CNS to another
- Motor neurones carry signals from the CNS to effectors
- Synapses- where two neurones meet there is a tiny gap called a synapses. Signals cross the gap using chemicals.
- When a receptor is stimulated it sends a signal to the central nervous system, where the brain coordinates the response, but sometimes a very quick response is needed, one that does not involve the brain: this is a reflex action
- Stimulus->receptor->sensory neurone->rlay neurone->motor neurone->effector
- An effector is any part of the body that produces the response, an example is a muscle contracting
- Recptors: A group of specialised cells that can detect changes in the enviroment- Stimuli
- Ears- Sound and position of head
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