What is the significance of juxtaglomerular apparatus (JGA) in kidney function?

Explanation

**Step-by-Step Solution:**

1. **Definition of Juxtaglomerular Apparatus (JGA):**
- The Juxtaglomerular Apparatus (JGA) is a specialized structure located in the kidney, specifically at the junction of the afferent arterioles and the distal convoluted tubule of the nephron. It consists of specialized cells that play a crucial role in kidney function.

2. **Components of JGA:**
- The JGA is composed of three main types of cells:
- **Juxtaglomerular cells:** Located in the walls of the afferent arterioles, these cells are responsible for the secretion of renin.
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