Which hormone surge triggers ovulation?

Which hormone surge triggers ovulation?

• A. Luteinizing Hormone
• B. Follicle-Stimulating Hormone
• C. Estrogen
• D. Progesterone

Answer: (A)

Ovulation is triggered by a surge of luteinizing hormone released from the anterior pituitary. As the dominant follicle matures, estrogen levels rise and reach a threshold that produces positive feedback on the hypothalamus and pituitary. This prompts a sharp LH surge, and the peak LH causes the follicle to rupture and release the oocyte. LH also stimulates the formation of the corpus luteum, which then produces progesterone to prepare the endometrium. So the initiating signal for ovulation is the LH surge. FSH mainly supports follicle growth, estrogen rise sets the stage for the LH surge, and progesterone rises after ovulation.

Ovulation is triggered by a surge of luteinizing hormone released from the anterior pituitary. As the dominant follicle matures, estrogen levels rise and reach a threshold that produces positive feedback on the hypothalamus and pituitary. This prompts a sharp LH surge, and the peak LH causes the follicle to rupture and release the oocyte. LH also stimulates the formation of the corpus luteum, which then produces progesterone to prepare the endometrium. So the initiating signal for ovulation is the LH surge. FSH mainly supports follicle growth, estrogen rise sets the stage for the LH surge, and progesterone rises after ovulation.