Podcast
Questions and Answers
What condition is necessary for air to flow into the alveoli during inspiration?
What condition is necessary for air to flow into the alveoli during inspiration?
- The alveolar pressure must be slightly below atmospheric pressure. (correct)
- The alveolar pressure must be significantly higher than atmospheric pressure.
- The alveolar pressure must be equal to atmospheric pressure.
- The alveolar pressure must be slightly above atmospheric pressure.
When the glottis is open and there is no airflow, what is the pressure in the respiratory tree, including the alveoli, relative to atmospheric pressure?
When the glottis is open and there is no airflow, what is the pressure in the respiratory tree, including the alveoli, relative to atmospheric pressure?
- Equal to atmospheric pressure (correct)
- Significantly below atmospheric pressure
- Varies greatly depending on the location in the respiratory tree
- Slightly above atmospheric pressure
Which of the following best describes the alveolar pressure during normal inspiration?
Which of the following best describes the alveolar pressure during normal inspiration?
- It increases significantly above atmospheric pressure.
- It decreases to about +1 cm of water.
- It remains constant throughout the inspiration phase.
- It decreases to about -1 cm of water. (correct)
What volume of air is typically drawn into the lungs during normal quiet inspiration as a result of the slight negative alveolar pressure?
What volume of air is typically drawn into the lungs during normal quiet inspiration as a result of the slight negative alveolar pressure?
Approximately how long does normal quiet inspiration take, during which the alveolar pressure changes to draw air into the lungs?
Approximately how long does normal quiet inspiration take, during which the alveolar pressure changes to draw air into the lungs?
What is considered the zero reference pressure in the airways when measuring alveolar pressure?
What is considered the zero reference pressure in the airways when measuring alveolar pressure?
How does the pressure in the alveoli need to change relative to atmospheric pressure to facilitate the inward flow of air?
How does the pressure in the alveoli need to change relative to atmospheric pressure to facilitate the inward flow of air?
During the phase when no air is flowing and the glottis is open, how does the pressure within the alveoli compare to the pressure in other parts of the respiratory system?
During the phase when no air is flowing and the glottis is open, how does the pressure within the alveoli compare to the pressure in other parts of the respiratory system?
If alveolar pressure falls from 0 to -2 cm of water during inspiration, what effect would this likely have compared to a normal drop to -1 cm of water?
If alveolar pressure falls from 0 to -2 cm of water during inspiration, what effect would this likely have compared to a normal drop to -1 cm of water?
A patient has an alveolar pressure of +1 cm of water during an attempted inspiration. What is the most likely outcome?
A patient has an alveolar pressure of +1 cm of water during an attempted inspiration. What is the most likely outcome?
How would a restricted glottis affect the equalization of pressure throughout the respiratory tree when no air is flowing?
How would a restricted glottis affect the equalization of pressure throughout the respiratory tree when no air is flowing?
How does the duration of inspiration relate to the volume of air that enters the lungs, assuming a constant alveolar pressure?
How does the duration of inspiration relate to the volume of air that enters the lungs, assuming a constant alveolar pressure?
If a person is breathing more rapidly, but the volume of each breath remains the same, what must happen to the pressure gradient during each inspiration?
If a person is breathing more rapidly, but the volume of each breath remains the same, what must happen to the pressure gradient during each inspiration?
Which of the following is most directly responsible for creating a negative alveolar pressure during inspiration?
Which of the following is most directly responsible for creating a negative alveolar pressure during inspiration?
What is the effect on alveolar pressure if the lungs become less compliant (more stiff)?
What is the effect on alveolar pressure if the lungs become less compliant (more stiff)?
If a person is holding their breath with a closed glottis and their diaphragm is contracted, how does alveolar pressure compare to atmospheric pressure?
If a person is holding their breath with a closed glottis and their diaphragm is contracted, how does alveolar pressure compare to atmospheric pressure?
A person with emphysema has damaged alveoli. What is the likely effect on the magnitude of the alveolar pressure changes during normal breathing?
A person with emphysema has damaged alveoli. What is the likely effect on the magnitude of the alveolar pressure changes during normal breathing?
How will the time required for inspiration be affected by a narrowed airway, assuming alveolar pressure remains constant?
How will the time required for inspiration be affected by a narrowed airway, assuming alveolar pressure remains constant?
How does increased resistance in the airways directly influence the alveolar pressure required for inspiration?
How does increased resistance in the airways directly influence the alveolar pressure required for inspiration?
What would alveolar pressure most likely be immediately after forceful exhalation?
What would alveolar pressure most likely be immediately after forceful exhalation?
Flashcards
Alveolar Pressure
Alveolar Pressure
The pressure of the air inside the lung alveoli.
Pressure at Open Glottis
Pressure at Open Glottis
When the glottis is open and no air is flowing, the pressure in the lungs equals atmospheric pressure.
Atmospheric Pressure
Atmospheric Pressure
Atmospheric pressure is the zero reference point in the airways, equivalent to 0 centimeters of water pressure.
Inspiration Pressure Change
Inspiration Pressure Change
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Normal Inspiration Pressure
Normal Inspiration Pressure
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Study Notes
- Alveolar pressure refers to the air pressure inside the lung alveoli.
- When the glottis is open and no air is flowing in or out of the lungs, the pressure is equal to atmospheric pressure throughout the respiratory tree, including the alveoli.
- Atmospheric pressure is considered 0 centimeters of water pressure in the airways.
- For air to flow into the alveoli during inspiration, the pressure in the alveoli has to fall slightly below 0.
- During normal inspiration, alveolar pressure decreases to approximately -1 centimeter of water.
- The achieved slight negative pressure is enough to pull 0.5 liters of air into the lungs within the 2 seconds needed for normal quiet inspiration.
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