Final answer:
FSH acts on the growth of ovarian follicles and spermatogenesis, not directly on other hormones such as LH, TSH, ACTH, or GH. Both FSH and LH are released by the anterior pituitary in response to GnRH from the hypothalamus during the follicular phase.
Step-by-step explanation:
Follicle Stimulating Hormone (FSH) is acted upon by different factors within the endocrine system. Of the options provided, FSH primarily stimulates the growth of ovarian follicles in the ovary before the release of an egg in women, and spermatogenesis in men. It does not directly act on LH, TSH, ACTH, or GH. Instead, LH (Luteinizing Hormone) and FSH are both released by the anterior pituitary in response to Gonadotropin-releasing Hormone (GnRH) from the hypothalamus. The release of these hormones during the follicular phase causes several ovarian follicles to grow.
The anterior pituitary produces several hormones, including Growth Hormone (GH), Thyroid Stimulating Hormone (TSH), Adrenocorticotropic Hormone (ACTH), Follicle-Stimulating Hormone (FSH), and Luteinizing Hormone (LH). TSH, ACTH, FSH, and LH are known as tropic hormones because they regulate the functions of other endocrine glands.
Therefore, the correct answer to which hormone is acted upon by FSH is none of the listed options, as FSH acts on the ovarian follicles and spermatogenic tissues rather than the other hormones.