The blood circulatory system (cardiovascular system) delivers nutrients and oxygen to all cells in the body. It consists of the heart and the blood vessels running through the entire body. The arteries carry blood away from the heart; the veins carry it back to the heart.The system of blood vessels resembles a tree: The trunk, the main artery (aorta), branches into large arteries, which lead to smaller and smaller vessels.he arteries carry blood away from the heart; the veins carry it back to the heart. The system of blood vessels resembles a tree: The trunk, the main artery (aorta), branches into large arteries, which lead to smaller and smaller vessels.
You probably won't return to your pre-pregnancy weight for some time, but you will lose a significant amount of weight immediately after delivery. Subtracting one 7- to 8-pound baby, about a pound or so of placenta, and another few pounds of blood and amniotic fluid leaves most new moms about 12 pounds lighter.he weight keeps coming off, too. All the extra water your cells retained during pregnancy, along with fluid from the extra blood you had in your pregnant body, will be looking for a way out. So you'll produce more urine than usual in the days after birth â an astounding 3 quarts a day. You may perspire a lot, too.
You may also want to try to lose the baby weight first, for the best result. In brief: 4-6 months. At a minimum, 4-6 months after delivery. The physiologic changes of pregnancy take this long to settle down. You may also want to try to lose the baby weight first, for the best result.