they maintain the concentration of dissolved substances in the blood (amount of water, ions and remove urea in urine) 2 kidneys on the back wall of the abdomen
Water and Ions enter the body when you drink and eat. The levels need to be maintained because too much water moving into or out of cells may damage them.
Blood vessels carry blood through kidneys where 3 processes occur:
ULTRA FILTRATION- lots of water and small molecules are squeezed out the blood (under pressure) into tubules in the kidney.
SELECTIVE REABSORPTION- all the sugar, plus any ions and water needed by the body are reabsorbed back into the blood from the tubules.
EXCRETION OF WASTE- excess water, ions and all of the urea now pass into the bladder as urine and is stored there before it's released from the body.
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