Question

Glomerular filtration occurs because

• A. Afferent glomerular capillary is wider than efferent glomerular capillary.
• B. Afferent glomerular capillary is narrower than efferent glomerular capillary.
• C. Afferent glomerular arteriole is narrower than efferent glomerular arteriole.
• D. Afferent glomerular arteriole is wider than efferent glomerular arteriole.

Answer 1

The correct option is D Afferent glomerular arteriole is wider than efferent glomerular arteriole.

The efferent arteriole carries blood away from the glomerulus. Because it has a smaller diameter than the afferent arteriole, it creates some resistance to blood flow, producing the back-up of blood in the glomerulus which creates higher pressure in the glomerular cavity. This causes the glomerular filtration.

Therefore, the correct answer is option D.