very tiny blood vessels connecting the arteries and veins capillaries the largest blood vessels have names
aorta is the main artery of the heart carrying oxygenated blood to all parts of except for the lungs. vena cava large vein carrying deooxygenated blood back to the heart
superior vena cava returns blood from the upper body inferior vena cava returns blood from the lower body
a mascular organ a size of a fist.located just behind and slightly left of the breastbone.pumps blood through a network of arteries,veins and capillaries.called the cardiovascular seystem
the heart is made up of four chambers 1.right atrium 2. right ventricle .3 left atrium 4. left ventricle
control the flow of blood through the heart by opening and closing during contractions.allows blood to flow in only in one direction .mitral and triscupid valve control blood flow from the atria to the ventricles.aortic and pulmonary valve control flow out of the ventricles.