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Human Respiratory System: Anatomy of the Lungs
and intertitles to illustrate human anatomy and physiology. Beginning with the organs of respiration, it highlights the structure and function of the nose, larynx, trachea, bronchi, and lungs ...
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Figure 6 - Effects of intrathoracic and extrathoracic obstruction on the caliber of airways.
Extrathoracic obstruction is increased during inspiration because of the effect of atmospheric pressure to compress the trachea below the site of obstruction.