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Section O: Excretion (Kidneys (the blood supply (blood is brought to the…
Section O: Excretion
Kidneys
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the system also includes the ureter, the bladder and the urethra
they produce the liquid, Urine, which contains several waste products including Urea, water and salt
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Nephrons
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Ultrafiltration
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Small molecules e.g. urea, glucose, salts and water are forced out of the blood in the capillary knot
Together with water, they form the glomerular filtrate into the Bowman’s capsule
Selective reabsorption
Useful substances need to be taken back into the blood so that they do not end up in the urine. This process is called selective reabsorption
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Treating kidney disease
kidney transplant
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recipient needs to take immune suppressant to reduce risk of rejection - more susceptible to disease
Dialasys
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the tubing is surrounded by a fluid with contains dissolved salt and glucose at normal body concentration
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large molecules, protein and blood cells do not cross tubing
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