What is the effect of blocking negative feedback of estrogen on the pituitary gland?

• A. Increased production of luteinizing hormone alone
• B. Decreased follicle-stimulating hormone production
• C. Increased production of both FSH and LH
• D. Decreased ovulation rate

Answer: (C)

Blocking negative feedback of estrogen on the pituitary gland leads to an increased production of both luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Under normal circumstances, estrogen exerts a negative feedback effect on the anterior pituitary gland and hypothalamus, suppressing the secretion of these gonadotropins.

When this feedback is disrupted, it removes the inhibitory signals, leading to enhanced secretion of FSH and LH. This can result in a surge in gonadotropin levels, which plays a crucial role in the regulation of the menstrual cycle and ovulation. Increased levels of FSH stimulate follicle development in the ovaries, while increased LH is essential for ovulation and the subsequent formation of the corpus luteum. The dynamic nature of this interaction is critical for the reproductive cycle and highlights the importance of hormonal feedback mechanisms in endocrinology.