LH and FSH are called gonadotrophins. Why?

Answer

**Step-by-Step Solution:**

1. **Definition of LH and FSH**: LH stands for Luteinizing Hormone and FSH stands for Follicle Stimulating Hormone. Both are important hormones in the reproductive system.

2. **Role of LH and FSH**: These hormones play a crucial role in regulating the functions of the gonads, which are the reproductive organs. In males, the gonads are the testes, and in females, they are the ovaries.

3. **Function of Gonadotropins**: LH and FSH stimulate the gonads to produce sex hormones and gametes. For example, in males, LH stimulates the production of testosterone, while FSH is involved in sperm production. In females, LH triggers ovulation and the production of estrogen and progesterone, while FSH stimulates the growth of ovarian follicles.

4. **Source of LH and FSH**: Both hormones are produced and secreted by the anterior pituitary gland, specifically from cells known as gonadotrophs.

5. **Conclusion**: Therefore, LH and FSH are referred to as gonadotropins because they are hormones that promote the activity of the gonads, facilitating reproduction.