Final answer:
The statement that the corpus luteum secretes only progesterone is false; it also secretes estradiol. These hormones inhibit certain reproductive hormones' production and maintain the endometrium, and their balance is crucial for the menstrual cycle.
Step-by-step explanation:
The statement "The corpus luteum secretes progesterone only" is false. The corpus luteum, which forms in the ovary after ovulation, secretes not only progesterone but also estradiol. Progesterone plays multiple roles in the female reproductive system: it inhibits GnRH, FSH, and LH production and maintains the endometrium. The degradation of the corpus luteum leads to a decline in progesterone levels, which in turn initiates the sloughing of the stratum functionalis, a process known as menstruation.
In addition, the corpus luteum secretes estradiol, which, together with progesterone, blocks the production of GnRH by the hypothalamus and LH and FSH by the pituitary gland. This hormonal feedback prevents the initiation of another ovulatory cycle immediately and plays a role in the further development of the endometrium in anticipation of potential pregnancy.