JG cells kidney produces

Options

A. Rennin
B. Renin
C. erythropoitin
D. Both (2) and (3)

Answer

**Step-by-Step Solution:**

1. **Understanding JG Cells**: JG cells, also known as juxtaglomerular cells, are specialized cells located in the kidney. They play a crucial role in regulating blood pressure and maintaining fluid balance.

2. **Function of JG Cells**: The primary function of JG cells is to synthesize, store, and secrete an enzyme called renin. Renin is an important enzyme in the renin-angiotensin-aldosterone system (RAAS), which regulates blood pressure and fluid balance.

3. **Renin Production**: When blood pressure drops or there is a decrease in sodium chloride concentration in the distal convoluted tubule, JG cells release renin into the bloodstream.

4. **Role of Renin**: Renin acts on a protein called angiotensinogen, converting it into angiotensin I, which is then converted into angiotensin II. Angiotensin II is a potent vasoconstrictor that raises blood pressure and stimulates the release of aldosterone, leading to increased sodium and water reabsorption in the kidneys.

5. **Conclusion**: Therefore, the correct answer to the question "JG cells in the kidney produces" is renin.

**Final Answer**: JG cells in the kidney produce renin.

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