High blood glucose, also called blood sugar, can harm your baby during the first weeks of pregnancy, even before you know you are pregnant. If you have diabetes and are already pregnant, see your doctor as soon as possible to make a plan to manage your diabetes.
These are the only veins in the body that carry fresh, oxygenated blood. Blood leaves the heart from the left ventricle through the artery called the aorta. The aorta has several branches into other arteries that are carrying blood away from the heart and to the body tissues.
Blood returns to the heart from the body via two large blood vessels, called the superior vena cava and the inferior vena cava. This blood carries little oxygen, as it is returning from the body where oxygen is used. The blood first enters the right atrium. It then flows through the tricuspid valve into the right ventricle.