Sertoli cells are involved in :-

Options

A. Secretory cells
B. respiratory cells
C. Excretory cells
D. Nurse cells.

Answer

**Step-by-Step Solution:**

1. **Understanding Sertoli Cells**: Sertoli cells are specialized cells found in the seminiferous tubules of the testes. Their primary role is to support and nourish developing sperm cells (spermatozoa).

2. **Functions of Sertoli Cells**:
- They provide structural support to the developing sperm.
- They supply nutrients to the sperm cells.
- Sertoli cells help in the maturation of spermatozoa.
- They are also involved in the secretion of certain hormones and proteins that are essential for sperm development.

3. **Regulation by Hormones**: The activity of Sertoli cells is regulated by the Follicle Stimulating Hormone (FSH), which is produced by the pituitary gland. FSH stimulates Sertoli cells to promote spermatogenesis (the process of sperm production).

4. **Nurse Cells**: Due to their supportive role in the development of spermatozoa, Sertoli cells are often referred to as "nurse cells." They play a crucial role in the male reproductive system by ensuring that sperm cells develop properly.

5. **Conclusion**: Based on the functions and characteristics of Sertoli cells, the correct answer to the question "Sertoli cells are involved in:" is that they are involved in the nourishment and support of developing spermatozoa.

**Final Answer**: Sertoli cells are involved in nourishing spermatozoa (often referred to as nurse cells).

---