B6-The nervous system
- Created by: Emma Mason
- Created on: 05-05-13 12:16
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- B6-The nervous system
- Different parts
- Central nervous system (CNS)
- It is a processing centre
- Co-ordinates responses after receiving information from the receptors
- sensory neurones
- Carry impulses from receptors to CNS
- Motor neurones
- Carries impulses from CNS to effectors.
- Effectors
- There are two types of effectors
- Muscle cells which make muscles
- Hormone secreting cells, these are found in glands
- There are two types of effectors
- Receptors
- Cells that detect stimuli
- Different types eg, taste and sound
- They respond to nervous impulses and bring about a change.
- They can from part of larger complex organs, eg The retina in the eye is covered in light receptor cells.
- Central nervous system (CNS)
- Stimulus
- Receptor
- Sensory neurone
- CNS
- Motor neurone
- Effector
- Response
- Effector
- Motor neurone
- CNS
- Sensory neurone
- Receptor
- NEURONES AND SYNAPSES
- Neurones are nerve cells
- Not attached to each other
- Infrormation is transmitted around the body by neurones
- When stimulated, neurones transmit information around the body as electrical impulses.
- The gap between two neurones is a synapse
- When an electrical impulse reaches the end of a neurine it triggers the release of transmitter chemicals into the synapse
- Transmitter chemicals diffuse across the gap and bind to receptor molecules on the membrane of the next neurone.
- Only specific transmitter chemicals can bind to the receptor molecules on the neurone.
- When chemicals bind to the correct receptors they trigger a new electrical impulse in the next neurone
- Only specific transmitter chemicals can bind to the receptor molecules on the neurone.
- Transmitter chemicals diffuse across the gap and bind to receptor molecules on the membrane of the next neurone.
- Some drugs affect transmission across synapses
- Eg, ecstacy, beta blockers and PROZAC.
- Neurones are nerve cells
- Different parts
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