Reabsorption is minimum in

Options

A. PCT
B. Henle's loop
C. DCT
D. 1 and 3

Answer

**Step-by-Step Solution:**

1. **Understanding Reabsorption**: Reabsorption is the process by which solutes and water are reabsorbed into the bloodstream after filtration in the kidneys. This ensures that essential substances are not lost in urine.

2. **Identifying the Parts of the Nephron**: The nephron consists of several parts, including:
- Proximal Convoluted Tubule (PCT)
- Loop of Henle
- Distal Convoluted Tubule (DCT)

3. **Analyzing Reabsorption in Each Part**:
- **Proximal Convoluted Tubule (PCT)**: This is where the majority of reabsorption occurs. Approximately 50-70% of water, sodium chloride (NaCl), bicarbonate ions, potassium, and nutrients are reabsorbed here.
- **Loop of Henle**: This structure has a minimal reabsorption capacity. It primarily reabsorbs water, but no significant reabsorption of ions or solutes occurs in this part.
- **Distal Convoluted Tubule (DCT)**: Similar to the PCT, the DCT also reabsorbs NaCl, water, and bicarbonate ions, but to a lesser extent than the PCT.

4. **Conclusion**: Since the question asks where reabsorption is minimum, we can conclude that the Loop of Henle is the part of the nephron with the least reabsorption activity, as it primarily allows for the reabsorption of water only.

5. **Final Answer**: The minimum reabsorption occurs in the **Loop of Henle**.

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