ECOLOGY
EXCRETORY PRODUCTS AND THEIR ELIMINATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -Excess salts diffuse into the dialysis fluid. The dialysis fluid contains no urea, so all of the urea diffuses from the blood in to the dialysis fluid from the high concentration in the blood to the lower concentration in the dialysis fluid.
Detailed explanation-2: -As the dialysis fluid has no urea in it, there is a large concentration gradient-meaning that urea moves across the partially permeable membrane, from the blood to the dialysis fluid, by diffusion. This is very important as it is essential that urea is removed from the patients’ blood.
Detailed explanation-3: -So, the correct answer is ‘Salt and urea’
Detailed explanation-4: -Urea generation rate varied widely in dialysis patients, rather independently of body size. Dialysing to 1.2 in an unselected patient population resulted in great variations in time-averaged concentration (TAC) and average predialysis concentration (PAC) of urea (5.9–40.2 and 8.6–55.8 mmol/L, resp.).