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Respiratory System Pleural Pressure Quiz

18 Questions

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Respiratory System Pleural Pressure Quiz

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Questions and Answers

What is the normal pleural pressure when respiratory muscles are completely relaxed and airways are open?

0 mm Hg

-2.5 mm Hg (correct)

-10 mm Hg

-6 mm Hg

What happens to the pleural pressure during inspiration due to chest wall expansion?

Becomes more negative (correct)

Remains at -2.5 mm Hg

Becomes more positive

Balances out

What is the clinical significance of intrapleural pressure becoming equal to atmospheric pressure?

Chest wall expands

Pneumothorax occurs (correct)

Breathing becomes easier

Lungs expand

What is transpulmonary pressure defined as?

Difference between alveolar pressure and atmospheric pressure Signup and view all the answers

During expiration, what causes the decrease in alveolar pressure?

Increase in intrathoracic volume Signup and view all the answers

What results from the elastic recoil of the lungs compressing the air in the alveoli?

Increased lung volume Signup and view all the answers

What is the main muscle responsible for inspiration?

Diaphragm Signup and view all the answers

During inspiration, what happens to the intrapleural pressure?

Decreases Signup and view all the answers

Which muscle is involved in increasing the lateral and anterio-posterior diameters of the thoracic cage during inspiration?

External intercostal muscles Signup and view all the answers

What defines transpulmonary pressure?

Pressure difference between alveolar pressure and intrapleural pressure Signup and view all the answers

Which factor plays a significant role in changing the compliance of the lungs?

Elasticity of lung tissue Signup and view all the answers

In which phase of respiration would one typically observe a decrease in pleural pressure?

Inspiration Signup and view all the answers

What is the role of the abdominal muscles in expiration?

Compress the abdominal cavity and push the diaphragm up Signup and view all the answers

How does intrapleural pressure relate to pleural pressure?

Intrapleural pressure is the pressure of fluid between the visceral and parietal pleura Signup and view all the answers

What causes intrapulmonary pressure to decrease during inspiration in quiet breathing?

Elastic recoil of the lungs Signup and view all the answers

How does intrapulmonary pressure change during expiration in quiet breathing?

Swings slightly to the positive side (+1 mm Hg) Signup and view all the answers

What is transpulmonary pressure?

Pressure difference between intrapulmonary and intrapleural pressure Signup and view all the answers

In quiet breathing, what is the significance of intrapulmonary pressure reaching 0 mm Hg at end-inspiration?

It allows about 500 mL of air to be sucked into the lungs Signup and view all the answers