Question

Assertion: The process of filtration takes place in Malpighian corpuscles
Reason: The total blood pressure is very high in glomerular capillaries
A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C Assertion is correct but Reason is incorrect
D Both Assertion and Reason are incorrect

Answer 1

Filtration is the mass movement of water and solutes from plasma to the renal tubule that occurs in the renal corpuscle. Malpighian corpuscles is also known as renal corpuscle.

Complete Answer:
- Malpighian corpuscles or renal corpuscles consist of the glomerulus and its surrounding Bowman's capsule. The renal corpuscle acts to filter blood.
- Fluid from blood in the glomerulus is collected in the Bowman's capsule to form "glomerular filtrate", which is then further processed along the nephron to form urine. It does this via a filtration barrier.
- The process of filtration takes place in Malpighian corpuscles because the total pressure is very high in glomerular capillaries.
- It is because the afferent arteriole, which delivers blood to the glomerulus, has little vascular resistance because it is short and wide.
- So the pressure decrease is smaller compared to other tissues. And the pressure in capillaries of glomeruli is so high because it is specialized for filtration.

So the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

Note: Glomerular hydrostatic pressure is more due to short, wide, less resistance afferent arteriole which is essential for glomerular filtration process.