The ………..hormone is secreted by the ………..cells of kidneys stimulates the formation of erythrocyte.

Options

A. Erythropoietin , JG
B. Erythropoietin, Interstitial fibroblasts
C. Renin , JG
D. Renin. Macula densa

Answer

To solve the question, we need to identify the hormone that stimulates the formation of erythrocytes (red blood cells) and the specific cells in the kidneys that secrete this hormone.

### Step-by-Step Solution:

1. **Identify the Function of the Hormone**:
- The question states that the hormone stimulates the formation of erythrocytes. The process of forming red blood cells is known as erythropoiesis.

2. **Recall the Hormone Responsible for Erythropoiesis**:
- The hormone primarily responsible for stimulating erythropoiesis is **Erythropoietin**. This hormone is crucial for the production of red blood cells in the bone marrow.

3. **Identify the Source of Erythropoietin**:
- Erythropoietin is secreted by specific cells in the kidneys. The cells responsible for the secretion of erythropoietin are known as **Juxtaglomerular (JG) cells**.

4. **Combine the Information**:
- The hormone that stimulates the formation of erythrocytes is **Erythropoietin**, and it is secreted by the **Juxtaglomerular (JG) cells** of the kidneys.

5. **Final Answer**:
- The complete statement is: "The **Erythropoietin** hormone is secreted by the **Juxtaglomerular (JG) cells** of kidneys, stimulates the formation of erythrocyte."