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Unformatted text preview: Filtration fraction : (Figure 19-5) " net glomerular filtration pressure " Filtration pressure (Figure 19-6)- net bulk flow of protein-free plasma out of capillaries - hydrostatic pressure in the glomerulus is 55 mmHg (error in textbook) - hydrostatic pressure in Bowman's space is 15 mmHg - net hydrostatic pressure = 55 - 15 = 40 mmHg - But, there is a high protein content in the capillary as compared to Bowman's space. - therefore, net osmotic flow into glomerular capillaries = 30 mmHg Net Filtration Pressure = 40 - 30 = 10 mmHg Glomerular Filtration Rate = volume of plasma filtered into the Bowman's space per unit time (mL/min) = 125 mL/min = 180 L/day - kidney receives 20 - 25 % of cardiac output - filters the entire plasma volume 60x per day...
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- Fall '09