Topic 8 - Key areas

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How is an action potential generated along an axon?
How is an action potential generated along an axon?
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What is opened?
stimulated sodium channels
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What do the Sodium ions do?
diffuse into the axon
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What is depolarised?
the membrane
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What is then generated?
an axon potential
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What is generated between the nodes of ranvier?
electric current
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What happens if there are no schwann cells?
They slow down impulse and prevent transmission of impulse
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Light intensity and eyes
Light intensity and eyes
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What passes from the brain? and down which nerve?
nerve impulses along the parasympathetic nerve
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What contracts?
circular muscles
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What relaxes?
radial muscles
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what happens to the pupil?
It gets smaller
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What happens when light reaches a rod cell?
Light absorbtion splits rhodopsin into opsin and retinal
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What becomes less permeable? to what?
membrane to Na+
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What is still pumped out?
Na+
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What less is released?
less neurotransmitter released
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Other cards in this set

Card 2

Front

What is opened?

Back

stimulated sodium channels

Card 3

Front

What do the Sodium ions do?

Back

Preview of the front of card 3

Card 4

Front

What is depolarised?

Back

Preview of the front of card 4

Card 5

Front

What is then generated?

Back

Preview of the front of card 5
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