· The kidney carries out a process called osmoregulation
· Osmo: osmosis & regulation: control
· Cells in the body are ideally ISOTONIC with the tissues around them
· This means that the amount of water passing in and out of the cells are equal and therefore the cells stay the same size
· However the blood that circulates in and out of the cell maybe of a different concentration and therefore cause a HYPERTONIC or a HYPOTONIC solution.
· Both of these solutions could harm the cells and therefore the most desirable option is an ISOTONIC solution.
· This is why the composition of the blood has to be controlled and this is done so by the Kidney
· The kidney can control the composition of the blood by removing excess Water and Salt from the blood and excreting it.
· By controlling the content of water and salt in the blood the kidney can keep the cells ISOTONIC at all times.
Osmoregulation: Is when the composition of the blood is controlled by the kidneys through excreting waste water and salts to keep the cells in the body Isotonic.
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