Concentration of urine depends upon which organ -

Options

A. Bowman's capsule
B. Length of Henle's loop
C. P.C.T
D. Network of capillaries arising from glomerulus

Answer

To determine which organ is responsible for the concentration of urine, we can analyze the options provided:

1. **Bowman's Capsule**: This structure is primarily involved in the filtration of blood. It collects the filtrate from the blood but does not play a direct role in concentrating urine.

2. **Length of Henle's Loop**: The loop of Henle is a crucial part of the nephron, which is the functional unit of the kidney. It has a descending limb that is permeable to water and an ascending limb that is impermeable to water. This structure plays a vital role in the counter-current multiplication mechanism, which helps in the reabsorption of water and the concentration of urine.

3. **Proximal Convoluted Tubule (PCT)**: The PCT is involved in the reabsorption of nutrients, ions, and water from the filtrate but does not primarily concentrate urine.

4. **Network of Capillaries around Glomerulus**: This network is involved in the filtration process, transporting blood, but it does not contribute to urine concentration.

Based on this analysis, the organ that primarily influences the concentration of urine is the **Length of Henle's Loop**.

Thus, the correct answer is **Option B: Length of Henle's Loop**.