Which part of nephron of the human kidney is responsible for filtration of blood for excretion ?

The nephron is the structural and functional unit of the kidney. The process of excretion begins with ultrafiltration, which takes place in the renal corpuscle. The renal corpuscle consists of two parts: the glomerulus (a cluster of capillaries) and the Bowman's capsule.

Option D is correct because the Bowman's capsule is the double-walled, cup-like structure that surrounds the glomerulus. It acts as a filter, collecting water and small solutes (like glucose, salts, and urea) forced out of the blood due to high pressure, while retaining larger molecules like proteins and blood cells. This filtrate then passes into the renal tubules.

• Collecting duct: Involved in the reabsorption of water and transport of urine.
• Renal vein: Carries deoxygenated, filtered blood away from the kidney.
• Ureter: The tube that transports urine from the kidney to the urinary bladder.