Anatomy and Physiology II Practice Test

Luteinizing Hormone (LH) is regarded as the ovulating hormone because it plays a crucial role in the ovulation process within the menstrual cycle. LH is secreted by the anterior pituitary gland and is responsible for triggering the release of a mature egg from the ovary. This surge in LH, typically occurring around the middle of the menstrual cycle, marks the transition from the follicular phase to the luteal phase and is essential for ovulation to happen.

When the levels of estrogen rise significantly, they stimulate the anterior pituitary to release a surge of LH. This event is pivotal as it causes the final maturation of the ovarian follicle and the subsequent release of the ovum (egg). Without this LH surge, ovulation would not take place, making LH essential for reproduction.

While estrogen and progesterone are vital hormones in the menstrual cycle—regulating various stages and preparing the body for potential pregnancy—they do not directly trigger ovulation. Follicle-Stimulating Hormone (FSH) also contributes to the process by promoting the growth of ovarian follicles, but it is LH that primarily initiates ovulation. Therefore, LH is accurately described as the ovulating hormone due to its critical function in facilitating the release of the