18 Questions
What is the main function of the respiratory system?
To provide oxygen for the body and remove carbon dioxide
Which muscles are responsible for quiet expiration?
Abdominal muscles
What is the definition of intra-alveolar pressure?
The pressure inside the alveoli of the lungs
What is the primary function of intrapleural pressure?
To create a negative pressure that helps the lungs expand
What is the main function of surfactant?
To reduce the surface tension in the alveoli
What is the average value of intrapleural pressure?
-4 mmHg
What is the intrapleural pressure during deep inspiration?
-12 mmHg
What is the intra-alveolar pressure during the Valsalva maneuver?
+100 mmHg
In what situation can positive intrapleural pressure occur?
During the Valsalva maneuver
What is the primary function of surfactant in the alveoli?
To decrease surface tension and maintain alveolar expansion
Which of the following statements about intrapleural pressure is correct?
It is always positive, with an average of +4 mmHg
What is the primary function of Type I pneumocytes in the alveoli?
Facilitation of gas exchange
What is the significance of transpulmonary pressure (TPP)?
It is the pressure difference between the intra-alveolar and intrapleural pressures
Which of the following is a function of the negative intrapleural pressure?
It promotes lung inflation during inspiration
What is the primary component of surfactant responsible for reducing surface tension in the alveoli?
Dipalmitoylphosphatidylcholine (DPPC)
According to the LaPlace law, what happens to the tendency for alveolar collapse during expiration?
It increases as the alveolar radius decreases
Which type of alveolar cell is responsible for surfactant secretion?
Type II pneumocytes
What is the primary mechanism by which surfactant prevents pulmonary edema?
By decreasing filtration forces across the alveolar-capillary membrane
Explore the concept of Transpulmonary Pressure (TPP) and Intrapleural Pressure in respiratory physiology. Learn about the pressure difference across the wall of the lung and the importance of intrapleural pressure in lung function.
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