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Why does having multiple rod cells attached to same neurone mean it is more likely a generator potential can be produced?
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#2
(Original post by MEPS1996)
Why does having multiple rod cells attached to same neurone mean it is more likely a generator potential can be produced?
Why does having multiple rod cells attached to same neurone mean it is more likely a generator potential can be produced?
Say you've got 20% light intensity, and 5 rod cells. If they've each stimulated with 20%, it'll add up so you achieve the whole 100%, and a generator potential is produced.
If you have one cone cell at the 20% intensity, then that's only 20% out of 100%, so you won't have anywhere near enough for a generator potential to be generated.
Does that make a bit of sense?
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(Original post by Tappouni)
It's spacial summation, so a small stimulus to each builds up to generate a generator potential, if the small stimuli are sufficient to trigger one...think of it another way:
Say you've got 20% light intensity, and 5 rod cells. If they've each stimulated with 20%, it'll add up so you achieve the whole 100%, and a generator potential is produced.
If you have one cone cell at the 20% intensity, then that's only 20% out of 100%, so you won't have anywhere near enough for a generator potential to be generated.
Does that make a bit of sense?
It's spacial summation, so a small stimulus to each builds up to generate a generator potential, if the small stimuli are sufficient to trigger one...think of it another way:
Say you've got 20% light intensity, and 5 rod cells. If they've each stimulated with 20%, it'll add up so you achieve the whole 100%, and a generator potential is produced.
If you have one cone cell at the 20% intensity, then that's only 20% out of 100%, so you won't have anywhere near enough for a generator potential to be generated.
Does that make a bit of sense?
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#4
(Original post by MEPS1996)
cheers so is it about getting enough sodium ions across the membrane to generate enough of a electrical potential to start an action potential?
cheers so is it about getting enough sodium ions across the membrane to generate enough of a electrical potential to start an action potential?
Hope that helps
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#5
rods detect are the parts that detect black and white. they work at low levels of light and as said they do this by spatial summation where more than many pre-synaptic neurone all link to a single optic nerve neurone.
this is in contrast to our colour vision which works only in the light. cones only have one pre-synaptic neurone to a single optic nerve neurone (in contrast to the rods). this is why you only get colour vision when it is bright.
this is in contrast to our colour vision which works only in the light. cones only have one pre-synaptic neurone to a single optic nerve neurone (in contrast to the rods). this is why you only get colour vision when it is bright.
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