ANATOMY
RENAL TRACT AND RETROPERITONEUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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23
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20
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10
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16
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Detailed explanation-1: -Calculate the net filtration pressure if capillary hydrostatic pressure is 60 mm Hg, capillary osmotic pressure is 25 mm Hg, and capsular hydrostatic pressure is 10 mm Hg. *60-(25 + 10) = 25 mm Hg. The two pressures that oppose filtration must be subtracted from the force favoring filtration.
Detailed explanation-2: -NET FILTRATION PRESSURE (NFP) is the total pressure that promotes filtration. To calculate NFP, we subtract the forces that oppose filtration from the GBHP. A normal NFP (using the figures mentioned) would be: NFP=55-(15+30)=55-45=10mm Hg.
Detailed explanation-3: -Net filtration pressure averages 10 mm Hg (i.e., 55 mmHg −15 mmHg − 30 mmHg = 10 mmHg). This is in contrast to the 0.3 mmHg net pressure found in most capillaries of the body. The glomerular filtration rate (GFR) is the total amount of filtrate formed by the two million renal corpuscles in the kidneys divided by time.