[AS. lungen.] The lungs are the organs of respiration. In man the lungs lie in the thorax or chest on each side of the heart- -the right lung being a little shorter and broader than the left lung. They are light, spongy bodies, full of little cells which can be filled with air. The blood sent from the right side of the heart to the lungs is of a dark color, and contains much carbonic acid gas ; while the blood taken away from the lungs back to the left side of the heart is of a scarlet hue, and contains less carbonic acid gas and more oxygen. The oxygen is taken from the air that enters the lungs, while a nearly equal quantity of carbonic acid gas passes from the blood outwards into the air, and is expelled from the mouth. (See Heart.)

THE LUNGS, WIND PIPE AND HEART

THE LUNGS, WIND PIPE AND HEART