Osmoregulation

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Define osmoregulation
Control of water and salt levels in the body.
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What does osmoregulation try to do?
Maintain balance.
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What would happen if an organism was hot?
Try to conserve water, so collecting duct wall would be more permeable.
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What would happen if an organism was cold?
Conserve less water so collecting duct wall is less permeable to water.
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What does ADH stand for?
Antidiuretic hormone.
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Where is ADH released from?
The pituitary gland.
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What does ADH help?
Helps to increase reabsorption of water.
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What do osmoreceptors do?
Monitor water potential of the blood.
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What do the walls of the collecting duct respond to?
Respond to level of ADH in blood.
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What do the walls have?
Membrane-bound receptors complementary to ADH.
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Where are the osmoreceptors located?
In the hypothalamus in the brain.
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What happens when there is a low water potential?
Osmoreceptors lose water by osmosis.
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What does this cause the osmoreceptors to do?
Causes them to shrink.
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What happens after the osmoreceptors have shrunk?
The neurosecretory cells are stimulated.
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What do the neurosecretory cells do?
Release ADH.
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Where does the ADH go?
ADH in blood binds to membrane-bound receptors in wall.
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What does this binding cause?
Binding causes enzyme-controlled reactions.
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What happens after the enzyme-controlled reactions?
Aquaporins (water permeable channels) are inserted into the cell surface membrane.
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What does this insertion cause?
Causes walls of collecting duct to be more permeable to water.
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What does water do?
Water moves by osmosis through channels and reabsorbed into the blood.
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What happens when there is more ADH?
More aquaporins inserted, so collecting duct is more permeable and more water is reabsorbed.
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What happens when there is less ADH?
Surface membrane folds inwards. Creates new vesicles that remove aquaporins from the membrane, making collecting duct wall less permeable and less water is reabsorbed.
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Other cards in this set

Card 2

Front

What does osmoregulation try to do?

Back

Maintain balance.

Card 3

Front

What would happen if an organism was hot?

Back

Preview of the front of card 3

Card 4

Front

What would happen if an organism was cold?

Back

Preview of the front of card 4

Card 5

Front

What does ADH stand for?

Back

Preview of the front of card 5
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