The graph shows the relative blood plasma concentrations of four hormones during a typical 28-day human menstrual cycle.
Which of the following statements correctly identifies one of these hormones, its corresponding curve, its site of secretion, and its primary role?
Curve A represents oestrogen, which is secreted by the ovaries to stimulate the repair of the uterine lining (endometrium) and trigger the LH surge.
Curve B represents luteinising hormone (LH), which is secreted by the ovaries to trigger ovulation and the development of the corpus luteum.
Curve C represents progesterone, which is secreted by the anterior pituitary gland to maintain the lining of the uterus during the luteal phase.
Curve A represents progesterone, which is secreted by the corpus luteum to inhibit follicle-stimulating hormone (FSH) release during the follicular phase.
