They connect neurones --> the connection between two neurones is called a synapse.
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How is the nerve signal transferred in a synapse?
By chemicals which diffuse across the gap. --> the chemicals then set off a new electrical signal in the next neurone.
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What do reflexes do?
Help prevent injury.
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What are reflexes?
Automatic responses to certain stimuli.
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Give 2 examples of a reflex
1) If someone shines a bright light in your eyes --> pupils automatically get smaller --> so less light gets into the eye --> stops it getting damaged. 2) If you get a shock --> body releases the hormone adrenaline.
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What is a reflex arc?
The passage of information in a reflex (from receptor to effector).
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Where do the neurones in reflex arcs go through?
Spinal cord or an unconscious part of the brain. (the CNS).
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What happens when a stimulus (e.g. a painful bee sting) is detected by receptors?
Electrical impulses are sent along a sensory neurone to the CNS.
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What happens when the electrical impulses reach a synapse?
They trigger chemicals to be released --> these chemicals cause impulses to be sent down the next neurone.
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What happens when the impulse reaches the effector? (muscle)
The muscle contracts.
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What are so good about reflexes?
You don't have to think about the response (takes time)--> it's quicker than normal responses.
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Other cards in this set
Card 2
Front
How is the nerve signal transferred in a synapse?
Back
By chemicals which diffuse across the gap. --> the chemicals then set off a new electrical signal in the next neurone.
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