Question

Ultra filtration is due to pressure in the glomerulus because the diameter of afferent arteriole is greater than

• A. Glomerular capillaries
• B. Afferent venule
• C. Efferent venule
• D. Efferent arteriole

Answer 1

Answer: (D)

Efferent arteriole

The diameter of the afferent (incoming) arteriole is greater than the diameter of the efferent arteriole (by which blood leaves the glomerulus). The pressure of the blood inside the glomerulus is increased due to the difference in diameter of the incoming and out-going arterioles. This increased blood pressure helps to force the excretory components of the blood out of the glomerular capillaries.

So, the correct answer is option D.