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Respiratory System MapParts and Functions
1. Nose Smelling, tasting and breathing all start here. The size, location, mucus lining and tiny hairs (cilia) inside help prevent foreign objects from entering and trap large air impurities.
2. Mouth Mouth breathing can also be another place for air entry. Like the nose, it has many functions. It is the starting point of the digestive system as well as a secondary inhaler and exhaler.
3. Larynx The larynx has three main functions: 1) a passageway for air, 2) a valve to close off the air passage from the digestive one (the epiglottis) like a hinged trap door, and 3) as a voice box.
4. Lung The main function is to exchange carbon dioxide for oxygen and vice versa.
5. Right Bronchus Leads to a lung.
6. Diaphragm This muscular structure acts as a floor to the chest (thoracic) cavity as well as a roof to the abdomen. It helps to expand and contract the lungs, forcing air into and out of them.
7. Pharynx The pharynx is shared with the digestive system, food goes on down the esophagus and air passes on through the trachea - but never both at the same time!
8. Trachea This armored tube allows air to pass beyond the larynx to where it divides into the left and right bronchi.
9. Left Bronchus The left one has a sharper bend due to the presence of the heart and major blood vessels directly underneath it.
10. Bronchiole Each bronchus divides into smaller bronchioles. By the time the air has reached here from outside, it has been warmed up to body temperature, filtered and moisturized.
11. Alveoli These tiny air cells, or sacs, are the 'leaves' of our respiratory tree. Gas exchange happens here.
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