Question

Where do ultrafiltration, reabsorption and secretion occur in a nephron?

Answer 1

Nephron:

1. A nephron is a tube-like, strongly coil-shaped structure.
2. It filters blood to regulate chemical concentrations of water and soluble chemicals such as sodium salts and, as a result, creates urine.
3. The Malpighian body, or renal corpuscle, and renal tubules make up each nephron.

Occurrence of ultrafiltration, reabsorption, and secretion:

Ultrafiltration:

1. Ultrafiltration is the first step in the process of urine formation.
2. The glomerulus is liable for filtering the blood.
3. In Bowman's capsule, ultrafiltration takes place.

Reabsorption:

1. The glomerular filtrate reaches the renal tubule as a dilute solution in the second step of urine production, and various components present in the filtrate are reabsorbed.
2. The components in the filtrate are reabsorbed to the extent of $99\%$.
3. It takes place in the Proximal Convoluted Tubule, or PCT, Henle loop, Distal Convoluted Tubule, or DCT, and collecting duct.

Secretion:

1. Secretion is the final step in the process of production of urine.
   This process removes compounds such as $K^{+},N{a}^{+},H^{+}$ and certain chemicals that are not eliminated by filtration.
2. It takes place in the PCT, Henle loop, and DCT.