Which substance is in higher concentration in blood than in glomerular filtrate?
A
Water
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B
Glucose
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C
Urea
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D
Plasma proteins
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Solution
The correct option is D Plasma proteins The first step in the production of urine is the filtration of plasma passing through the kidney.
This filtration (sometimes called ultrafiltration as it occurs at the molecular level) occurs from the glomerular capillaries into the Bowman's capsule to form tubular fluid.
The glomerular filter prevents plasma proteins from passing into the nephrons but is permeable to all other plasma constituents (such as ions, glucose, amino acids, urea, etc).