Which hormone is released by the corpus luteum to maintain the uterine lining during the initial phases of pregnancy?

💡 Solution & Explanation

Progesterone is secreted primarily by the corpus luteum in the ovary following ovulation, acting essentially to thicken and maintain the endometrial lining for successful embryo implantation and early pregnancy sustenance. Other choices like estrogen play supportive roles in proliferation, while oxytocin regulates uterine contractions during childbirth and prolactin stimulates milk production.