Concept:Ultrafiltration is the pressure-driven filtering of blood to form glomerular filtrate inside the kidney nephron.
Explanation:Blood enters the glomerulus, a network of tiny capillaries.
This blood is under high pressure.
The inner lining of Bowman's capsule, together with the glomerular wall, acts as a filtration barrier.
Water and small dissolved substances are forced across this barrier.
The filtered fluid collects in the lumen of Bowman's capsule.
Thus, ultrafiltration takes place specifically at the Bowman's capsule of the nephron.
Answer:D. Bowman's Capsule