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The Respiratory System • Food combines with oxygen to produce energy this is RESPIRATION (chemical process) • BREATHING –moving air in & out of the body (mechanical process) provides the oxygen to the cells to use in respiration Interaction with other organ systems • The respiratory system closely interacts with the circulatory system. In the lungs tiny air sacs called alveoli are used in the diffusion of carbon dioxide and oxygen into and out of the blood. . • Nose cleans, warms and moisten the air • Pharynx where esophagus and trachea split Larynx contains vocal chords • Epiglottis flap that prevents food from entering trachea • Trachea carries air to lungs • Bronchi 2 branches of trachea that carries air to lungs • Lungs—a saclike organ that takes oxygen from the air and delivers oxygen to the blood • Bronchus –bronchi (pl.)—the two branches that split off the trachea • Bronchioles smallest tubes in lungs • Alveoli microscopic air sacs-exchange of O2 and CO2 takes place here