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.
There are no official UK guidelines for how much weight you should gain over your pregnancy. There is only general advice that most women put on somewhere between 10kg and 12.5kg (22lb to 28lb) (NHS 2011) . You'll gain most of the weight after 20 weeks (NHS 2011) .y the end of your pregnancy, you may weigh about 12.5kg (27.6lb) more than you did before you were pregnant (Murray and Hassall 2014:166) . This varies from person to person, so check out our pregnancy weight gain estimator to get a more personal figure based on your own height and pre-pregnancy weight.