Regulation of Urine Concentration

Regulation of Urine Concentration - Regulation of Urine...

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Regulation of Urine Concentration & Volume - Formation of dilute urine : normal course of filtration; low antidiuretic hormone (ADH) levels & collecting ducts remain impermeable to water - Formation of concentrated urine : increased release of ADH from posterior pituitary inhibits diuresis (urine output) by increasing reabsorption of water from collecting ducts (by creating water channels - aquaporins ) Diuretics : chemicals that enhance urinary output through inhibition of water or sodium ion reabsorption or increased osmotic pressure in kidney tubules - alcohol inhibits ADH release, while caffeine & drugs sodium ion reabsorption Renal clearance (RC) : volume of plasma that is cleared of a particular substance in a given time (1 minute) - used to determine GFR (glomerular filtration rate) & assess renal function - uses a molecule such as inulin that is not reabsorbed, stored or secreted as a standard (RC = 125 ml/min) Ureters : tubes that convey urine from kidneys to bladder
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Regulation of Urine Concentration - Regulation of Urine...

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