Unit 3

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Why are there mitochondria in the RODS of the eye?
To provide ATP for active transport to pump out the Na+ ions out of the rod.
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in RODS what happens to the cell when the Na+ ions are pumped out?
The rod cell becomes more negative (hyperpolarised).
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What does hyperpolarisation of a membrane mean?
A change in a cell's membrane potential that makes it more negative
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what happens to the eye in bright light?
Circular muscle fibres of iris contract. radial muscles relax. pupil diameter decreases. Depth of focus increases. less light enters the eye(preventing damage to retina).
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What happens to Dim light?
Radial muscles of iris contract. circular muscle fibres relax. pupil diameter increases. more light enters the eye. depth of focus decreased.
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what does depolarization mean?
when the pd reaches the threshold, more Na+ ions channels open.more Na+ ions diffuse into the neuron.
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What happens during depolarization?
During depolarization, the charge within the cell rapidly shifts from negative to positive
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What do photoreceptors do in your eye?
They are light receptors that convert light into an electrical impulse.
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what is bleaching?
when light energy causes rhodopsin to break apart into retinal and opsin.
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what does polarized mean?
difference in charge across a membrane.
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Other cards in this set

Card 2

Front

in RODS what happens to the cell when the Na+ ions are pumped out?

Back

The rod cell becomes more negative (hyperpolarised).

Card 3

Front

What does hyperpolarisation of a membrane mean?

Back

Preview of the front of card 3

Card 4

Front

what happens to the eye in bright light?

Back

Preview of the front of card 4

Card 5

Front

What happens to Dim light?

Back

Preview of the front of card 5
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