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14 Cards in this Set
- Front
- Back
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Synapse |
Connection between two neurones |
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How is nerve signal transferred? |
By chemicals which diffuse across the gap. |
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What do those diffused chemicals then do? |
They set off new electrical signal in the next neurone |
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The transmission of a nervous impulse is very fast but it is slowed down a bit at the synapse. Why is this? |
Diffusion across the synapse takes time |
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What do reflexes help prevent or reduce? |
It prevents Injury
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How do they reduce or prevent injury? |
Reflexes are automatic, rapid responses to stimuli |
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What is the reflex arc? |
The passage of information in a reflex from (receptor to effector) |
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What do the neurons in the reflex arc go through |
-Spinal chord
-Or through an unconscious part of the brain |
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What happens when a stimulus is detected by a receptor? |
Impulses are sent along a sensory neurone to the CNS |
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What happens when the impulses reach a synapse between the sensory neurons and a Relay neurone? |
They trigger chemicals to be released. These chemicals cause impulses to be sent along the relay neurone |
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What happens when the impulses reach between the relay neurone and motor neurone? |
Chemicals are released and cause impulses to he went along the motor neurone |
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The impulses travel along the motor neurone to where? |
Effector (muscle or gland) |
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The muscle then.. |
Contracts |
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Behaviour (waving) take similar pathway to reflexes |
It goes through conscious part of brain instead of unconscious |
