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Spermatogenesis starts at the age of pub...

Spermatogenesis starts at the age of puberty due to significant increase in the secretion of

A

somatostatin from hypothalamus

B

GnRH from hypothalamus

C

GnRH from the anterior pituitary

D

sexcorticoids from the adrenal gland

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The correct Answer is:
To solve the question regarding what initiates spermatogenesis at puberty, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Spermatogenesis**: - Spermatogenesis is the process of sperm cell development, which begins at puberty in males. 2. **Identifying Hormonal Regulation**: - The initiation of spermatogenesis is regulated by hormones. During puberty, there is an increase in certain hormones that stimulate this process. 3. **Key Hormones Involved**: - The primary hormone responsible for the start of spermatogenesis is Gonadotropin-Releasing Hormone (GnRH), which is secreted by the hypothalamus. 4. **Action of GnRH**: - GnRH stimulates the anterior pituitary gland to release two important hormones: Luteinizing Hormone (LH) and Follicle Stimulating Hormone (FSH). 5. **Role of LH and FSH**: - LH acts on Leydig cells in the testes to promote the production of androgens (male hormones), which are crucial for the development of sperm. - FSH acts on Sertoli cells, which support and nourish the developing sperm cells and are essential for spermiogenesis (the final stage of sperm development). 6. **Conclusion**: - Therefore, the significant increase in the secretion of Gonadotropin-Releasing Hormone (GnRH) from the hypothalamus at puberty is what initiates spermatogenesis. ### Final Answer: Spermatogenesis starts at the age of puberty due to a significant increase in the secretion of **Gonadotropin-Releasing Hormone (GnRH) from the hypothalamus**.
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