What proportion of filtered glucose is reabsorbed within the proximal convoluted tubule_______________?
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Answer: A. 100%
Explanation
The proximal convoluted tubule possesses specialized transport proteins for active glucose reabsorption. Sodium-glucose cotransporters capture virtually all filtered glucose molecules from the tubular lumen. Consequently, under normal physiological conditions, exactly one hundred percent of filtered glucose is reabsorbed. Glomerular filtration produces an ultrafiltrate containing plasma levels of freely filtered glucose. The proximal convoluted tubule is the primary site for bulk solute and water reabsorption. Renal transport maximums can be exceeded if blood glucose levels rise pathologically high.
Nephrologists study tubular transport mechanics to understand normal renal physiological function. Glycosuria occurs in untreated diabetes mellitus when filtered glucose exceeds maximal reabsorptive capacity. Renal function tests help evaluate tubular integrity and systemic metabolic control. Zero percent reabsorption would imply complete loss of all filtered glucose in the urine. Sixty percent reabsorption is incorrect because the proximal tubule retrieves all normal glucose loads. Fifty percent reabsorption does not reflect normal healthy renal glucose handling physiology.
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