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