Question

The blood pressure within the glumerular capillaries is _________ of mercury.

(a) 80 mm

(b) 70-80 mm

(c) 90 mm

(d) 70-90 mm

I had been asked this question in a national level competition.

The origin of the question is Medical Diagnosis with Chemical Tests topic in chapter Clinical Laboratory Instruments of Biomedical Instrumentation

Answer 1

The correct answer is (d) 70-90 mm

The explanation is: The renal arteries carry blood at very high pressure from the aorta into the glomerular capillary tuft. The blood pressure within the glomerular capillaries is 70–90 mm of mercury. The blood flow through the capillary tuft is controlled by the state of contraction of the muscle of the arteriole leading to the tuft.