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STH2203 LU3:EXCRETION (ROLE OF KIDNEYS (Filtration - Reabsorption…
STH2203 LU3:EXCRETION
DEFINITION
Removing chemicals, metabolic waste and product through out the body of organism
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IMPORTANT
- Eliminate waste and unused products from the body
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- Stabilize the body environment
- Maintaining the body concentration such as ions exchange
ROLE OF KIDNEYS
Amphibians
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GRF low, TS high - conserve H2O
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Reptiles
Marine reptiles - water shortage and abundant salts. So, excess salt remove by salt glands (NOT kidneys)
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Mammals / Birds
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Most bird does not have urinary bladder. So, they eliminate in the form of URIC ACID - to allow more water retention
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Human Urinary System
Tubular Reabsorption
PROXIMAL TUBULE, LOOP OF HENLE, DISTAL TUBULE
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