25/27 A small animal shut up in a close jar soon dies for want of air. We need the oxygen which the air contains. Oxygen causes a sort of burning in our bodies. The burning in our bodies keeps us warm, and destroys some of the waste matters. The breathing organs are the windpipe and bronchial tubes, the voice-box, the epiglottis, the nostrils, the soft palate, the lungs, the air-cells, the pleura, the diaphragm, and the chest walls. |