Inhibin is produced by

Options

A. Corpus luteum
B. Testis
C. Placenta
D. All the above.

Answer

**Step-by-Step Solution:**

1. **Understanding Inhibin**: Inhibin is a protein hormone that plays a crucial role in the regulation of reproductive functions, particularly in the male reproductive system.

2. **Sources of Inhibin**: Inhibin is produced by several structures in the body:
- **Sertoli Cells in Testes**: The primary source of inhibin in males is the Sertoli cells located in the testes. These cells are essential for spermatogenesis and help regulate the production of follicle-stimulating hormone (FSH).
- **Corpus Luteum**: In females, inhibin is produced by the corpus luteum, which forms after ovulation and is involved in regulating the menstrual cycle and pregnancy.
- **Pituitary Gland**: The pituitary gland also produces inhibin, which has a role in feedback regulation of FSH secretion.
- **Placenta**: During pregnancy, the placenta produces inhibin as well.

3. **Conclusion**: Therefore, inhibin is produced by:
- Sertoli cells in the testes
- Corpus luteum
- Pituitary gland
- Placenta

4. **Final Answer**: All of the above options are correct regarding the sources of inhibin.