The human body could not function without respiration. Oxygen combines with food to supply the body with (14). Oxygen travels through the (15) to every organ and other part of the body that needs it. To bring in oxygen to the lungs, a person must (16). (17) expels (18) such as carbon dioxide and water. The whole process is called (19). Air is breathed in through the (20) and is (21) by the hair and mucus of the nasal linings. The filtered air passes through the (22) into the branches of the windpipe called (23). The air sacs, called (24), allow oxygen to enter the bloodstream through (25). At the same time, (26) moves from the capillaries into the alveoli. The bronchi and alveoli make up the (27). The muscular (28) separates the chest cavity from the (29). The diaphragm (30) to allow air into the lungs and (31) to force out carbon dioxide and waste.