Which of the following types of filtrate contains abnormally high concentrations of glucose, amino acids, and mineral salts?
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Answer: A. Glomerular filtrate
Explanation
Glomerular filtrate is produced through passive ultrafiltration driven by high blood pressure inside renal corpuscle capillaries. Because the filtration membrane allows small solutes to pass freely, the initial filtrate contains abundant glucose and amino acids. The nephron must subsequently reabsorb these valuable nutrients actively before the remaining fluid becomes final urine excretion. Ultrafiltration forces water and small solutes out of glomerular blood plasma while retaining large blood proteins and cells. Renal reclamation mechanisms ensure that essential metabolites like glucose and amino acids are not lost in human urine. The Bowman capsule catches this initial filtrate and directs it into the proximal convoluted tubule for reabsorption.
Filtrate passing through the ascending limb has already undergone significant solute reabsorption, reducing its nutrient concentration. Fluid reaching the distal convoluted tubule has lost nearly all filtered glucose and amino acids through prior reuptake. Collecting tubules process largely modified fluid destined for excretion, containing metabolic wastes rather than high nutrient levels.
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