In nephron, water absorption is maximum in

Options

A. Distal convoluted tubule
B. Proximal convoluted tubule
C. Glomerulus
D. Henle's loop

Answer

To determine where water absorption is maximum in the nephron, we can analyze the structure and function of the nephron components. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understanding the Nephron Structure**: The nephron is the functional unit of the kidney and consists of several parts: the renal corpuscle (which includes the glomerulus), the proximal convoluted tubule (PCT), the loop of Henle (which includes the descending and ascending limbs), and the distal convoluted tubule (DCT).

2. **Identifying Water Absorption Sites**: Each part of the nephron has a specific role in the filtration and absorption process. Water absorption occurs primarily in the PCT, loop of Henle, and DCT.

3. **Analyzing the Proximal Convoluted Tubule (PCT)**: The PCT is lined with cuboidal epithelial cells that have microvilli (brush border). This structure significantly increases the surface area for absorption. It is known that approximately 65-70% of the filtered water is reabsorbed here.

4. **Examining the Loop of Henle**: The loop of Henle has a descending limb that is permeable to water and an ascending limb that is impermeable to water. However, the amount of water reabsorbed here is less than in the PCT.

5. **Considering the Distal Convoluted Tubule (DCT)**: The DCT also reabsorbs some water, but it is much less than in the PCT. The DCT is influenced by hormones such as aldosterone and antidiuretic hormone (ADH) for water reabsorption.

6. **Conclusion**: Based on the analysis, the maximum water absorption in the nephron occurs in the proximal convoluted tubule (PCT), where approximately 65-70% of the filtered water is reabsorbed.

### Final Answer:
The maximum water absorption in the nephron occurs in the **proximal convoluted tubule (PCT)**.

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