Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

Normally, the net glomerular filtration pressure is about

A. 5 mm Hg B. 10 mm Hg

C. 15 mm Hg D. 20 mm Hg

Summary Introduction


The process of urine formation occurs in the renal corpuscle via glomerular capillaries. While the filtrate leaves the glomerular capillary, from there, the urine is received by Bowman’s capsule. There are three forces that influence the rate of filtration, which are the hydrostatic pressure, the fluid pressure in Bowman’s capsule, and the osmotic force caused by the protein difference. Hydrostatic pressure enhances the rate of filtration while the other two limit it.


Explanation/justification for the correct answer:

Option (b) is, ‘10 mm Hg’. The net glomerular filtration pressure is calculated by taking in consideration all the three acting forces, hydrostatic pressure (+55mm Hg), fluid pressure (-15 mm Hg, opposing force), and osmotic pressure (-30 mm Hg, opposing force). As the net glomerular filtration pressure is the algebraic sum of these which comes to be 10 mm Hg, option (b) is correct.

Explanation for incorrect answer:

Option (a) is, ‘5 mm Hg’...

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