In kidney macula densa is present in

Options

A. Proximal convoluted tubule
B. Loop of Henle
C. Distal convoluted tubule
D. Bowman's capsule.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where the macula densa is located in the kidney.

2. **Identifying the Options**: The options provided are:
- PCT (Proximal Convoluted Tubule)
- Loop of Henle
- DCT (Distal Convoluted Tubule)
- Bowman's Capsule

3. **Locating the Macula Densa**: The macula densa is a specialized structure found in the kidney. It is specifically located in the DCT (Distal Convoluted Tubule) of the nephron.

4. **Function of the Macula Densa**: The cells of the macula densa are columnar and more densely packed compared to surrounding cells. They act as chemoreceptors that monitor the chemical composition of the filtrate passing through the DCT.

5. **Connection to Juxtaglomerular Apparatus**: The macula densa cells communicate with the juxtaglomerular apparatus, which is responsible for regulating blood pressure and fluid balance by secreting the hormone renin when necessary.

6. **Conclusion**: Based on the above information, the correct answer to the question is that the macula densa is present in the DCT.

**Final Answer**: The macula densa is present in the DCT (Distal Convoluted Tubule).

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