Reabsorption does not occurs in

Options

A. PCT of kidney
B. DCT of kidney
C. Artificial kidney
D. All the above

Answer

To solve the question "Reabsorption does not occur in," we will analyze each option provided.

### Step-by-Step Solution:

1. **Understand the Concept of Reabsorption:**
- Reabsorption is a process that occurs in the kidneys, specifically in the nephron, where substances such as water, glucose, and ions are reabsorbed back into the bloodstream after filtration.

2. **Evaluate Option 1: Proximal Convoluted Tubule (PCT):**
- The PCT is known to be the major site of reabsorption in the nephron. It reabsorbs a significant amount of water, glucose, amino acids, and ions.
- **Conclusion:** Reabsorption occurs in the PCT. This option is incorrect.

3. **Evaluate Option 2: Distal Convoluted Tubule (DCT):**
- The DCT also plays a role in reabsorption, particularly of water and electrolytes. It is involved in the fine-tuning of the composition of urine.
- **Conclusion:** Reabsorption occurs in the DCT. This option is incorrect.

4. **Evaluate Option 3: Artificial Kidney:**
- An artificial kidney, or dialysis machine, does not perform reabsorption in the same way that biological kidneys do. Instead, it filters blood and removes waste products without reabsorbing substances back into the bloodstream.
- **Conclusion:** Reabsorption does not occur in an artificial kidney. This option is correct.

5. **Evaluate Option 4: All the Above:**
- Since we have established that reabsorption occurs in both the PCT and DCT, the statement "All the above" is incorrect.
- **Conclusion:** This option is incorrect.

### Final Answer:
The correct answer is **Option 3: Artificial Kidney**, as reabsorption does not occur in this structure.

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