Spermatogenesis in mammals is controlled by

Options

A. F.S.H. (Follicle stimulating hormone)
B. L.H.
C. F.S.H. and prolactin
D. Growth hormone and prolactin.

Answer

**Step-by-Step Solution:**

1. **Understanding Spermatogenesis**:
- Spermatogenesis is the process by which haploid spermatozoa develop from germ cells. This occurs in the seminiferous tubules of the testes.

2. **Process of Spermatogenesis**:
- It begins with the mitotic division of stem cells in the testes.
- The mitotic division produces two types of cells:
- Type A cells, which replenish the stem cells.
- Type B cells, which differentiate into primary spermatocytes.

3. **Meiosis in Spermatogenesis**:
- Primary spermatocytes undergo meiosis I to form secondary spermatocytes.
- Secondary spermatocytes then divide by meiosis II to produce haploid spermatids.
- Finally, spermatids mature into spermatozoa (sperms).

4. **Hormonal Control of Spermatogenesis**:
- The process of spermatogenesis is regulated by hormones, primarily Follicle Stimulating Hormone (FSH) and testosterone.
- Sertoli cells in the testes have receptors for FSH and testosterone, which are crucial for the regulation of spermatogenesis.

5. **Evaluating the Options**:
- **Option 1: FSH** - Correct, as FSH is essential for the regulation of spermatogenesis.
- **Option 2: LH** - Incorrect, as LH primarily stimulates the Leydig cells and does not directly control spermatogenesis.
- **Option 3: FSH and Prolactin** - Incorrect, as prolactin is involved in milk production and not spermatogenesis.
- **Option 4: Growth Hormone and Prolactin** - Incorrect, as growth hormone stimulates body growth and prolactin is related to lactation.

6. **Conclusion**:
- The correct answer is **Option 1: FSH (Follicle Stimulating Hormone)**, as it plays a significant role in the regulation of spermatogenesis in mammals.

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