Question

Pressure which favours filtration and one which opposes filtration of blood are ________ and respectively

• A. Capsular hydrostatic pressure and glomerular osmotic pressure
• B. Glomerular hydrostatic pressure and glomerular osmotic pressure
• C. Glomerular osmotic pressure and glomerular hydrostatic pressure
• D. Glomerular osmotic pressure and arterial pressure

Answer 1

Answer: (B)

Glomerular hydrostatic pressure and glomerular osmotic pressure

The first step in the urine formation is the filtration of blood which is carried out by the glomerulus and is called glomerular filtration. The amount of the filtrate formed by the kidneys per minute is called the glomerular filtration rate (GFR). The net filtration pressure is the outward pressure minus the inward pressure i.e Glomerular (blood) hydrostatic pressure-(glomerular osmotic pressure+Capsular hydrostatic pressure) =60mm Hg - (30 mm HG +20 mmHg) = 10 mm Hg. Hence pressure which favours filtration and one which opposes filtration of blood are glomerular hydrostatic pressure and glomerular osmotic pressure respectively.

So, the correct answer is 'Glomerular hydrostatic pressure and glomerular osmotic pressure'.