understand how the kidney carries out its role of excretion and of osmoregulation.
-osmo: osmosis
-regulation: control
-the fluid which surrounds the cell- must be isotonic with the cytoplasm of the cells- the water going in and out of is equal and the cells will remain the same size and the same shape and maintain their function.
-the danger to the tissue is that blood circulating into the tissue would be concentrated causing a hypertonic tissue fluid (remove to much water) or it may be very dilute causing a hypotonic tissue fluid (add too much water).
-so we want to keep the tissue fluid isotonic to the cells cytoplasm- achieved by controlling the composition of blood.
-blood forms the tissue fluid- role of kidney to control the composition of blood.
-blood with circulates through our kidney excess water, salts can be removed and excreted down the ureter.
-by controlling the content of water and salts in the blood the kidney can keep the blood and therefore the tissue fluid isotonic with the cells cytoplasm maintaining the function of the cell.
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