which of the following is not the function of Sertoli cells (sustentacular cells)?

Options

A. Release of androgen binding protein
B. Release of antimullerin factor
C. Regulate Spermatogenesis by relesing inhibin
D. Secretion of testosterone

Answer

To determine which of the following is not a function of Sertoli cells (sustentacular cells), we need to first understand the roles of Sertoli cells in the male reproductive system.

### Step-by-Step Solution:

1. **Understanding Sertoli Cells**: Sertoli cells are located within the seminiferous tubules of the testes. They play a crucial role in supporting and nourishing developing sperm cells (spermatogenesis).

2. **Functions of Sertoli Cells**:
- **Nourishment of Sperm**: Sertoli cells provide nutrients to the developing sperm cells and help in their maturation.
- **Secretion of Androgen Binding Protein (ABP)**: They secrete ABP, which binds to testosterone and helps maintain high levels of testosterone in the seminiferous tubules, facilitating spermatogenesis.
- **Regulation of Spermatogenesis**: Sertoli cells release inhibin, which regulates the production of follicle-stimulating hormone (FSH) through a negative feedback mechanism.
- **Secretion of Anti-Müllerian Hormone (AMH)**: They also secrete AMH, which is important for male reproductive organ development.

3. **Identifying the Incorrect Function**: Among the functions listed, we need to identify which one is not performed by Sertoli cells.
- **Secretion of Testosterone**: This is a key point. Testosterone is not secreted by Sertoli cells; it is produced by Leydig cells, which are located outside the seminiferous tubules.

4. **Conclusion**: Therefore, the function that is not associated with Sertoli cells is the secretion of testosterone.

### Final Answer:
The function that is not performed by Sertoli cells is the **secretion of testosterone**.