a) The role of the kidney in the excretion of urea which is made from nitrogen in the form of amino acids, excess amounts can be toxic to the body therefore needs to be excreted.
Amino acids are broken down in to urea in the liver. Urea then circulates with blood into the kidneys which then filters the blood from the urea. Water is then added to urea to create urine and is then transferred to the bladder ready for excretion.
b) Osmoregulation
Osmo : osmosis
Regulation : to control
Osmoregulation : to control the transfer of liquids
It is the role of the kidney to control the composition of the blood; maintaining control of excess water and salts in the blood by excretion, which in turn keeps the tissue fluid isotonic to the cell cytoplasm maintaining functions of cells.
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