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|DIgestive Tract Model Chart (9)||by GreenFlames09 on Flickr|1. The Nose-
- Draws air in through the nostrils to the pharynx.
- The throat.
- Connects the nose to the larynx.
- Voice box
- connects pharynx to trachea.
- Connects larynx to the bronchus.
|cartilage||by jetheriot on Flickr|5. Bronchi
- Main tubes run from trachea to bronchioles.
- Lead into lungs.
- Made of smooth muscle.
|Normal lung: Alveoli||by Pulmonary Pathology on Flickr|7. Alveoli
- Air sacs in the lungs.
- Where gas exchange takes place.
- Smallest part of the respiratory system.
|lung illustration||by Joe Crawford (artlung) on Flickr|Lungs
- The largest, most important organs in respiration and ventilation.
- The right lung has three lobes and the left lung only has two.
- The heart tucks in between the two lungs and into the left lung.
- The diaphragm (not pictured), is a structure located beneath the lungs. The major function of the diaphragm is assisting with breathing.
- When breathing, the diaphragm will move. During inspiration, the diaphragm moves downward and the lungs expand, filling with oxygen. During expiration, the diaphragm moves upward to a normal position, and carbon dioxide is forced out of the lungs.