Question

Ultrafiltration occurs in a glomerulus when?

• A. Hydrostatic pressure exceeds osmotic pressure
• B. Osmotic pressure exceeds hydrostatic pressure
• C. Capsular hydrostatic pressure exceeds glomerular hydrostatic pressure
• D. Colloidal osmotic pressure plus capsular pressure remain less than blood hydrostatic pressure

Answer 1

Answer: (D)

Colloidal osmotic pressure plus capsular pressure remain less than blood hydrostatic pressure

Glomerulus is responsible for filtration. GFR depends on :-

(i) glomerular hydrostatic pressure - it supports filtration

(ii) colloid osmotic pressure - it opposes filtration

(iii) capsular hydrostatic pressure - it opposes filtration

So the net filtration rate is equal to colloidal osmotic pressure plus capsular pressure remains less than hydrostatic pressure.

Hence, the correct answer is (D)