The abdominal aorta begins after the aorta passes through a muscle called the diaphragm, at the level of the twelfth thoracic vertebra (a spot in the upper abdomen). From there, it travels downward, ...

It also thins the uterine lining, making it difficult for a fertilized egg to implant. Hormonal IUDs begin working within seven days of insertion and can stay in the uterus and effectively prevent ...