Pressure in Occluded Alveoli Quiz

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During normal inspiration, what is the average pleural pressure?

-7.5 cm of water (correct)

-1 cm of water

0 cm of water

-5 cm of water

In normal inspiration, what happens to the pleural pressure from -5 to -7.5 cm of water?

Remains constant

Increases (correct)

Fluctuates

Decreases

What is the value of alveolar pressure during normal inspiration?

+1 cm of water

+7.5 cm of water

-1 cm of water (correct)

-7.5 cm of water

How does the alveolar pressure change during expiration?

Rises to +1 cm of water Signup and view all the answers

What is the effect of alveolar radius on pressure during inspiration?

Increased radius causes decreased pressure Signup and view all the answers

To pull air into the alveoli during inspiration, what must the pressure in the alveoli be in relation to atmospheric pressure?

Below atmospheric pressure Signup and view all the answers

What happens to the pressure in occluded alveoli due to surface tension?

It increases, attempting to push the air out. Signup and view all the answers

How does the radius of an alveolus affect the pressure generated by surface tension?

The smaller the alveolus, the greater the alveolar pressure. Signup and view all the answers

What is the significance of having small alveoli in premature babies?

Many have alveoli with radii much smaller than adult alveoli. Signup and view all the answers

What happens to lung expansibility when the thoracic cage is considered?

Muscular effort is required even if lungs are absent in the thorax. Signup and view all the answers

How is the compliance of the entire pulmonary system measured?

By expanding the lungs of a fully relaxed individual. Signup and view all the answers

What effect does a half-normal radius have on alveolar pressure caused by surface tension?

It doubles the pressure compared to normal size. Signup and view all the answers

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 Signup and view all the answers

What does transpulmonary pressure represent?

Pressure difference between alveoli and pleural pressure Signup and view all the answers

Which term describes the extent to which the lungs will expand for each unit increase in transpulmonary pressure?

Lung compliance Signup and view all the answers

What is the purpose of a compliance diagram of the lungs as described in the text?

Relating lung volume changes to transpulmonary pressure changes Signup and view all the answers

In what direction do the elastic forces of the lungs tend to move during respiration?

Collapse the lungs Signup and view all the answers

How would an increase in alveolar radius affect pressure in occluded alveoli?

Decrease pressure Signup and view all the answers