Osmoregulation = Osmosis/regulation (control of composition of blood)
Tissue flood surrounds cells must be Isotonic with the cytoplasm of the cells. This means that the amount of water going into and out of these cells is equal and the cells shall remain the same size and function.
The danger to the tissue is that blood that is circulating into the tissue would be concentrated causing a hypertonic tissue flood. Or may be very dilute causing a hypotonic tissue flood. Both of these are undesirable. Hypertonic would remove too much water and Hypotonic would add too much water. We want to keep the tissue fluid Isotonic to the cell cytoplasm.
This is achieved my controlling the composition of blood. Blood forms the tissue fluid. It is the role of the kidney to control the composition of blood. Blood which circulates though 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 tissue fluid isotonic with the cell cytoplasm, maintaining the functions of the cells.
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