What typically causes anovulation when influenced by high levels of prolactin?

The correct answer focuses on the physiological role of prolactin in the reproductive system. High levels of prolactin are known to suppress the secretion of luteinizing hormone-releasing hormone (LHRH) from the hypothalamus. LHRH is crucial for stimulating the pituitary gland to release luteinizing hormone (LH) and follicle-stimulating hormone (FSH). When prolactin is elevated, it inhibits LHRH production, leading to decreased levels of LH and FSH. This disruption interrupts the normal ovarian cycle, ultimately resulting in anovulation.

In contrast, increased LH and FSH would normally promote ovulation, but with high prolactin levels, these hormones are not adequately produced. Elevated estrogen production is usually associated with ovarian function and would not be a direct effect of high prolactin levels. Elevated progesterone is typically a result of ovulation, so it would not be the cause of anovulation. Thus, the suppression of LHRH by high prolactin is the critical mechanism that leads to the absence of ovulation.