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NERVOUS SYSTEM
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- 1RECEPTORS are groups of specialised cells that can detect changes in the environment called stimuli. certain receptors respond to different stimulilike the tounge responds to chemicals in food
ears respond to sound
skin responds to touch, pressure sound and temperature - 2Neurones are nerve cells that carry information as tiny electrical signals. There are three different types of neuronesSENSORY NEURONS carry signals from receptors to the spinal cord and brain
RELAY NEURONS carry messages from one part of the CNS to another
MOTOR NEURONS carry signals from the CNS to effectors. - 3Where two neurones meet there is a tiny gap called a synapse. Signals cross this gap using chemicals. One neurone releases the chemical into the gap. The chemical diffuses across the gap and makes the next neurone transmit an electrical signal.sometimes a very quick response is needed, one that does not involve the brain: this is a reflex action.
Sequence
In a simple reflex action:
stimulus → receptor → sensory neurone → relay neurone → motor neurone → effector
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- (biology) science Fichas sobre NERVOUS SYSTEM, creado por cho-jones el 13/05/2013.
- Creado por
- cho-jones · may 2013
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- 19 feb 2016
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