Describe how the kidneys convert filtrate in the nephron into dilute or concentrated urine by tubular...

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Medical Sciences

Describe how the kidneys convert filtrate in the nephron intodilute or concentrated urine by tubular reabsorption and tubularsecretion (include the importance of the nephron loop and thehormonal regulation of urine concentration). please describe inessay form

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Urinary excretion Glomerular filtration Tubular reabsorption Tubular secretion Proximal Tubule About 65 percent of the filtered ele ctrolytes is reabsorbed in the proximal tubule However the proximal tubular membranes are highly permeable to water so that whenever solutes are reabsorbed water also diffuses through the tubular membrane by osmosis Therefore the osmolarity of the fluid remains about the same as the glomerular filtrate 300 mOsmL Descending Loop of Henle As fluid flows down the descending loop of Henle water is absorbed into the medulla The descending limb is highly permeable to water but much less permeable to sodium chloride and urea Therefore the osmolarity of the fluid flowing through the descending loop gradually increases until it is nearly equal to that of the surrounding See Answer

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