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Questions and Answers
During normal inspiration, the average pleural pressure decreases to about -7.5 cm H2O.
True
Alveolar pressure during normal inspiration falls slightly below atmospheric pressure, to about +1 cm H2O.
False
A slight negative alveolar pressure of about -1 cm of H2O is enough to push air out of the lungs during expiration.
False
The trachea lies posterior to the esophagus and superior to the larynx.
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The normal pleural pressure at the beginning of inspiration is approximately 0 cm H2O.
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Alveolar pressure must rise to +1 cm of H2O during expiration to expel the 0.5 L of inspired air out of the lungs.
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The alveolar pressure during inspiration equals atmospheric pressure, which is considered to be +1 cm H2O.
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Expansion of the chest cage during normal inspiration pulls outward on the lungs with lesser force.
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The slight negative alveolar pressure of -1 cm H2O is sufficient to draw 0.5 L of air into the lungs during normal quiet expiration.
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Trachea is a rigid tube that extends through the mediastinum and lies anterior to both the esophagus and larynx.
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