Final answer:
Rising estrogen during the proliferative phase of the menstrual cycle causes the endometrium to grow and thicken, inhibits contractions of the myometrium, and thins the cervical mucus to allow sperm to pass through.
Step-by-step explanation:
The rising estrogen during the proliferative phase of the menstrual cycle also has several effects. First, it causes the lining of the uterus, known as the functional layer of the endometrium, to grow and thicken in preparation for potential implantation of a fertilized egg.
Second, it inhibits prostaglandin-induced contractions of the myometrium, which is the muscle layer of the uterus. This helps to maintain the thickened endometrial lining and prevent premature shedding.
Finally, estrogen thins the cervical mucus, making it easier for sperm to pass through the cervix and into the uterus around the time of ovulation, increasing the chances of fertilization.