A special sensitive region formed by cellular modification in DCT and afferent arteriole at the location of their contact is called

Answer

To solve the question regarding the special sensitive region formed by cellular modification in the distal convoluted tubule (DCT) and the afferent arteriole at their point of contact, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Nephron**:
- The nephron is the functional unit of the kidney. It consists of several parts: Bowman's capsule, proximal convoluted tubule (PCT), loop of Henle, distal convoluted tubule (DCT), and collecting duct.

2. **Identify the Key Components**:
- The DCT is located after the loop of Henle and before the collecting duct. The afferent arteriole is the blood vessel that supplies blood to the glomerulus.

3. **Locate the Contact Point**:
- At the point where the DCT comes into contact with the afferent arteriole, there is a specialized region that is crucial for kidney function.

4. **Define the Specialized Region**:
- This region is known for its sensitivity to changes in blood pressure and composition. It plays a critical role in regulating blood flow and filtration rate in the nephron.

5. **Name the Structure**:
- The specialized region formed by the modification of the DCT and the afferent arteriole is called the **Juxtaglomerular Apparatus (JG Apparatus)**.

6. **Explain the Function**:
- The JG apparatus consists of juxtaglomerular cells (JG cells) and macula densa cells. It helps regulate blood pressure and the glomerular filtration rate (GFR) by releasing hormones and adjusting the diameter of the afferent arteriole.

### Final Answer:
The special sensitive region formed by cellular modification in the DCT and afferent arteriole at the location of their contact is called the **Juxtaglomerular Apparatus (JG Apparatus)**.

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