The lining of each seminiferous tubule is made up of 2 types of cells - A and B. ‘A’ cells undergo meiosis and result in sperm formation. ‘B’ cells secrete

Options

A. Testosterone
B. Estrogen
C. FSH
D. None of these

Answer

To solve the question, we need to identify the types of cells present in the seminiferous tubules and their functions.

### Step-by-Step Solution:

1. **Identify the Cells**: The seminiferous tubules are lined with two types of cells: A and B.
- Cell A is responsible for undergoing meiosis, which leads to the formation of sperm.
- Cell B has a different function that we need to determine.

2. **Function of Cell A**:
- Cell A refers to the male germ cells, specifically spermatogonia, which undergo meiosis to produce spermatozoa (sperm cells). This process is crucial for male fertility.

3. **Function of Cell B**:
- Cell B refers to Sertoli cells. These cells play a supportive role in the seminiferous tubules. They provide nourishment to the developing sperm cells and also secrete various substances that are important for sperm development.

4. **Substances Secreted by Sertoli Cells**:
- Sertoli cells secrete several important substances, including:
- Androgen-binding protein (ABP), which helps in concentrating testosterone in the seminiferous tubules.
- Inhibin, which regulates the production of FSH (Follicle Stimulating Hormone).
- Nutrients and other factors that support spermatogenesis.

5. **Conclusion**:
- Based on the functions of the two types of cells, we conclude that Cell A is responsible for sperm formation through meiosis, and Cell B (the Sertoli cells) secretes substances that support the development of sperm and regulate hormonal functions.

### Final Answer:
- Cell A undergoes meiosis and results in sperm formation, while Cell B (Sertoli cells) secretes substances that support sperm development.