Secreation of which hormon induce/start spermatogensis:-

Options

A. GnRH
B. LTH
C. Oxytocin
D. Relaxin

Answer

To determine which hormone induces or starts spermatogenesis, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Hormones**: The question provides a list of hormones: GnRH, LTH, oxytocin, and lexy.

2. **Understand the Role of GnRH**: GnRH stands for Gonadotropin-Releasing Hormone. It is secreted by the hypothalamus.

3. **Function of GnRH**: The primary role of GnRH is to stimulate the anterior pituitary gland to release two important hormones: Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH).

4. **Role of FSH in Spermatogenesis**: Once FSH is released into the bloodstream, it travels to the testes where it acts on Sertoli cells. Sertoli cells are essential for nourishing and supporting the development of sperm cells.

5. **Initiation of Spermatogenesis**: The stimulation of Sertoli cells by FSH is crucial for the initiation and progression of spermatogenesis, which is the process of sperm cell development.

6. **Conclusion**: Therefore, the secretion of GnRH is what induces and starts spermatogenesis by promoting the release of FSH, which in turn stimulates the Sertoli cells in the testes.

### Final Answer:
The hormone that induces or starts spermatogenesis is **Gonadotropin-Releasing Hormone (GnRH)**.

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