18 Questions
During normal inspiration, what is the average pleural pressure?
-7.5 cm of water
In normal inspiration, what happens to the pleural pressure from -5 to -7.5 cm of water?
Increases
What is the value of alveolar pressure during normal inspiration?
-1 cm of water
How does the alveolar pressure change during expiration?
Rises to +1 cm of water
What is the effect of alveolar radius on pressure during inspiration?
Increased radius causes decreased pressure
To pull air into the alveoli during inspiration, what must the pressure in the alveoli be in relation to atmospheric pressure?
Below atmospheric pressure
What happens to the pressure in occluded alveoli due to surface tension?
It increases, attempting to push the air out.
How does the radius of an alveolus affect the pressure generated by surface tension?
The smaller the alveolus, the greater the alveolar pressure.
What is the significance of having small alveoli in premature babies?
Many have alveoli with radii much smaller than adult alveoli.
What happens to lung expansibility when the thoracic cage is considered?
Muscular effort is required even if lungs are absent in the thorax.
How is the compliance of the entire pulmonary system measured?
By expanding the lungs of a fully relaxed individual.
What effect does a half-normal radius have on alveolar pressure caused by surface tension?
It doubles the pressure compared to normal size.
What is the pressure in all parts of the respiratory tree, including the alveoli, when the glottis is open and no air is flowing?
Atmospheric pressure
What does transpulmonary pressure represent?
Pressure difference between alveoli and pleural pressure
Which term describes the extent to which the lungs will expand for each unit increase in transpulmonary pressure?
Lung compliance
What is the purpose of a compliance diagram of the lungs as described in the text?
Relating lung volume changes to transpulmonary pressure changes
In what direction do the elastic forces of the lungs tend to move during respiration?
Collapse the lungs
How would an increase in alveolar radius affect pressure in occluded alveoli?
Decrease pressure
This quiz covers the topic of pressure in occluded alveoli caused by surface tension. It includes calculations related to the amount of pressure generated in an alveolus when the air passages are blocked.
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