In which part of the kidney does ultrafiltration take place?

A. Bowman’s capsule
B. Distal convoluted tubule
C. Proximal convoluted tubule
D. Collecting duct
E. Afferent arteriole

Correct Answer: Option A

A. Bowman’s capsule

Explanation:

Ultrafiltration occurs at the barrier between the blood and the filtrate in the glomerular capsule (Bowman’s capsule) in the kidneys. As in nonbiological examples of ultrafiltration, pressure (in this case blood pressure) and concentration gradients lead to a separation through a semipermeable membrane (provided by the podocytes). The Bowman’s capsule contains a dense capillary network called the glomerulus. Blood flows into these capillaries through the afferent arterioles and leaves through the efferent arterioles.