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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