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18 Cards in this Set
- Front
- Back
What is the thing called that triggers a response in a reflex arc? |
Stimulus |
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What are receptors? |
Organs that receive the stimulus |
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What are the five receptors called? |
Eyes (see the stimulus) Ears (hear the stimulus) Skin (feel the stimulus) Nose (smell the stimulus) Tongue/mouth (taste the stimulus) |
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When the receptor has received the stimulus, what is the neurone called that carries the nerve impulse to the central nervous system? |
Sensory neurone |
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What is at the end of the sensory neurone? |
Synapse |
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What does the synapse do? |
Holds chemicals that diffuse across the gap between the synapse and next neurone |
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Which neurone is one the other side of the first synapse? |
Relay neuron |
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What happens when the impulse reaches the end of the relay neurone? |
The impulse reaches the synapse and is diffused across the gap by the chemicals there |
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Which neurone is on the other end of the second synapse? |
Motor neurone |
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What happens when the impulse reaches the motor neurone? |
It travels along it until it reaches the next stage |
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What comes after the motor neurone in the reflex arc? |
Effector |
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What is the effector? |
Either a muscle or gland that will respond physically to the stimulus |
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If the effector is a muscle what does it do when the impulse reaches it? |
Contract to respond to the stimulus |
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If the effector is a gland what does it do when the impulse reaches it? |
Secretes a hormone to respond to the stimulus |
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What is the movement by the effector muscle/gland called? |
Response |
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What is a reflex arc? |
A response to a stimulus that you don't have to think about first |
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Why are reflex arcs quicker than normal responses? |
You don't have to think about them first, which takes time
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What are the seven steps to a reflex arc? |
1) Stimulus 2) Receptor 3) Sensory Neurone 4) Relay Neurone 5) Motor Neurone 6) Effector 7) Response |