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QUESTIONS |
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| (a) | Serotonin is a neurotransmitter which is produced by certain neurones in the brain. One of its effects is to increase the activity of sensory neurones in the brain. It also usually improves a persons mood and keeps them awake. the diagram shows a synapse at which serotonin is the neurotransmitter. | ||
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| (i) | Explain how the release of the neurotransmitter serotonin, by neurone A would initiate an impulse in neurone B. | ||
(3) |
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| (ii) |
The serotonin is normally rapidly reabsorbed from the synaptic cleft by 5HT carrier proteins in the presynaptic membrane. Suggest one advantage of rapidly reabsorbing the serotonin. |
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(1) |
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NEAB 1999 |
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