Maximum absorption of `Na_(+)` and `K_(+)` occurs in:

Options

A. Loop of Henle
B. Bowman's capsule
C. DCT
D. PCT

Answer

To determine where the maximum absorption of sodium (Na⁺) and potassium (K⁺) occurs in the nephron, we can analyze each part of the nephron step by step:

1. **Identify the Parts of the Nephron**: The nephron consists of several parts: Bowman's capsule, Proximal Convoluted Tubule (PCT), Loop of Henle, Distal Convoluted Tubule (DCT), and Collecting Duct.

2. **Understand the Function of Each Part**:
- **Bowman's Capsule**: This is primarily involved in the filtration of blood. It does not absorb significant amounts of sodium or potassium.
- **Proximal Convoluted Tubule (PCT)**: This section is responsible for the reabsorption of a large portion of the filtrate, including about 50-60% of sodium and potassium.
- **Loop of Henle**: This part is mainly involved in the reabsorption of water and some salts, but it does not have the maximum reabsorption of sodium and potassium.
- **Distal Convoluted Tubule (DCT)**: Here, sodium is reabsorbed, but in much smaller amounts compared to the PCT.
- **Collecting Duct**: This part also plays a role in the reabsorption of water and some ions, but again, it is not the site of maximum absorption for sodium and potassium.

3. **Conclusion**: Based on the analysis, the Proximal Convoluted Tubule (PCT) is the part of the nephron where the maximum absorption of sodium (Na⁺) and potassium (K⁺) occurs.

**Final Answer**: Maximum absorption of Na⁺ and K⁺ occurs in the Proximal Convoluted Tubule (PCT).

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