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Homeostasis In Action (Removing Waste Products (There is no control over…
Homeostasis In Action
Removing Waste Products
There is no control over water, mineral ion or urea loss by the lungs or skin
Urea, along with excess water and mineral ions, is removed via the kidneys in the urine
Water, mineral ions and urea are lost through the skin in sweat
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If the body cells lose or gain too much water by osmosis, they do not function efficiently
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The Human Kidney
A healthy kidney produces urine by filtering the blood, then it reabsorbs all of the glucose plus any mineral ions and water needed by the body
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The water balance of the blood is maintained by the hormone ADH, which changes the amount of water reabsorbed by the kidney tubules
Dialysis
In a dialysis machine, the concentration of dissolved substances in the blood is restored to normal levels
The levels of useful substances in the blood are maintained, while urea and excess mineral ions pass from the blood into the dialysis fluid
People with kidney failure may be treated by regular sessions on a kidney dialysis machine or by having a kidney transplant
Kidney Transplants
To try and prevent rejection of the donor kidney, the tissue types of the donor and the recipient are matched as closely as possible
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In a kidney transplant, a healthy kidney from a donor replaces the function of the diseased or damaged kidney