aussiechick007
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- Joined
- Sep 27, 2007
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- HSC
- 2008
marine fish:cutiepie123 said:can some one tell me what the difference between a kidney in a marine and a fresh water is and why? i think im about to cry i feel i have forgotten EVERYTHING
- kidney contains few small glomeruli, due to the low filtration rate.
- small quantities of concentrated urine are produced.
- this is because the water concentration outside the body is lower than inside, so it is already losing water to the surroundings, so needs to conserve water in urine.
freshwater fish:
- kidney contains many large glomeruli, due to the high filtration rate.
- large amounts of very dilute urine are produced.
- this is because the water concentration is higher outside the body than inside it, so it is gaining too much water via passive transport, so must get rid of it in its urine.