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Martin, a young man of 20, was in a car accident and is hemorrhaging. When he ar

ID: 93457 • Letter: M

Question

Martin, a young man of 20, was in a car accident and is hemorrhaging. When he arrives by ambulance at the hospital, he is stabilized. However, they notice that over the next day he does not urinate. Which of the three variables for determining net filtration pressure has changed and can account for the lack of urine formation?

A. Glomerular hydrostatic (blood) pressure has decreased.

B. Capsular hydrostatic pressure has decreased.

C. Blood colloidal osmotic pressure has decreased.

D. Glomerular hydrostatic (blood) pressure has increased.

Explanation / Answer

The answer is 'a'

Glomerular filtration rate (GFR) is termed as the rate of plasma filtered ml per min. The glomerular pressure is maintained in the afferent arteriole and efferent artriole for the filtration of plasma and forming urine. But in the above case the hydrostatic pressure has decreased.

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