Physiologists Are Investigating Renal Autoregulatory Mechanisms in an Animal Species

Physiologists are investigating renal autoregulatory mechanisms in an animal species that closely mimics human physiology.  During one of their experiments, renal blood flow and glomerular filtration rate are measured in an anesthetized animal in response to changes in mean arterial pressure.  The data they obtain is shown on the graph below. Assuming a hematocrit of 0.50, what is the best estimate of the filtration fraction when the mean arterial pressure is 120 mm Hg?

A) 0) 1
B) 0) 2
C) 0) 4
D) 0) 5
E) 0) 9

Correct Answer:

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