Friday, 28 October 2011

2.68b Osmoregulation

understand how the kidney carries out its roles of excretion and of osmoregulation

The kidney can control the amount of water and salts in the bloodstream, keeping the blood and tissue fluid isotonic and therefore maintaining the function of the cells

Osmoregulation
Osmo - osmosis (less conc. ==> more conc.)
Regulation - control


[1]
The blood circulating into the tissue could be very concentrated or dilute, causing the tissue fluid to be hypertonic or hypotonic - both of these conditions could remove or add too much water to the cells, causing the cells to lose its function

[2]
The kidneys keep the tissue fluid isotonic - controlling the composition of the blood
(Blood forms the tissue fluid)
Excess water and salts removed and excreted down into the ureter

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