Examples. We could go on and on with great examples of theme, but we won't-I promise. Let's just look at three examples and analyze what gives depth and meaning to these pieces of literature. Take Golding's The Lord of the Flies, for example. We know that Golding taught in a boys' school and later fought in WWII.
The main artery splits into the left pulmonary artery and the right pulmonary artery, each of which directs the blood to the corresponding lung. Along with the umbilical arteries, these are the sole arteries in the body that transport oxygen-depleted blood. The umbilical arteries are located in the uterus.
One superior and one inferior pulmonary vein arise from each lung. Your pulmonary veins, which are laden with oxygenated blood, enter your heart on the back side of the left atrium. Your heart pumps the oxygenated blood it receives from your lungs to the rest of your body.