Osmoregulation

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  • Created by: Steff06
  • Created on: 03-03-16 20:27
What is the definition of osmoregulation?
The control of salt and water levels in the body.
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How is water gained and lost in the body?
Gained through food, drink and metabolism. Lost through urine, faeces, sweat and water vapour in exhaled air.
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What happens when conserving less water?
The walls of the collecting duct become less permeable to water.
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What is the effect of less permeability to water?
Less water will be reabsorbed and more urine will be produced.
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What are the walls of the collecting duct responsive to?
Levels of antidiuretic hormone (ADH) in the blood.
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What does ADH do and what does this cause?
Binds to receptors in wall and causes enzyme-controlled reactions.
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What do the reactions cause and what effect does this have on the wall?
Causes insertion of vesicles containing aquaporins into cell surface membrane. Makes wall more permeable to water.
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What is the effect of less ADH?
Cell surface membrane folds inwards to create vesicles that remove aquaporins from membrane.
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What is water potential measured by?
Osmoreceptors in the hypothalamus.
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What happens when water potential is low?
Osmoreceptor cells lose water by osmosis.
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What cells release ADH and how do they do this?
Neurosecretory cells release ADH by sending action potentials down their axons.
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What will ADH enter and do?
Enters blood capillaries and act on the walls of the collecting duct.
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What happens when water potential rises?
Less ADH is released.
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What then happens to the ADH?
It is then broken down to prevent continuous stimulation of the collecting duct.
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Other cards in this set

Card 2

Front

How is water gained and lost in the body?

Back

Gained through food, drink and metabolism. Lost through urine, faeces, sweat and water vapour in exhaled air.

Card 3

Front

What happens when conserving less water?

Back

Preview of the front of card 3

Card 4

Front

What is the effect of less permeability to water?

Back

Preview of the front of card 4

Card 5

Front

What are the walls of the collecting duct responsive to?

Back

Preview of the front of card 5
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