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L2 Respiratory Pressure

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Questions and Answers

What is the main function of the respiratory system?

To produce hormones

To regulate blood pressure

To provide oxygen for the body and remove carbon dioxide (correct)

To filter air entering the body

Which muscles are responsible for quiet expiration?

Sternocleidomastoid muscles

Scalene muscles

Abdominal muscles (correct)

Diaphragm and intercostal muscles

What is the definition of intra-alveolar pressure?

The pressure inside the alveoli of the lungs (correct)

The pressure between the lungs and the chest wall

The pressure inside the pleural space

The pressure difference between the alveoli and the atmosphere

What is the primary function of intrapleural pressure?

To create a negative pressure that helps the lungs expand Signup and view all the answers

What is the main function of surfactant?

To reduce the surface tension in the alveoli Signup and view all the answers

What is the average value of intrapleural pressure?

-4 mmHg Signup and view all the answers

What is the intrapleural pressure during deep inspiration?

-12 mmHg Signup and view all the answers

What is the intra-alveolar pressure during the Valsalva maneuver?

+100 mmHg Signup and view all the answers

In what situation can positive intrapleural pressure occur?

During the Valsalva maneuver Signup and view all the answers

What is the primary function of surfactant in the alveoli?

To decrease surface tension and maintain alveolar expansion Signup and view all the answers

Which of the following statements about intrapleural pressure is correct?

It is always positive, with an average of +4 mmHg Signup and view all the answers

What is the primary function of Type I pneumocytes in the alveoli?

Facilitation of gas exchange Signup and view all the answers

What is the significance of transpulmonary pressure (TPP)?

It is the pressure difference between the intra-alveolar and intrapleural pressures Signup and view all the answers

Which of the following is a function of the negative intrapleural pressure?

It promotes lung inflation during inspiration Signup and view all the answers

What is the primary component of surfactant responsible for reducing surface tension in the alveoli?

Dipalmitoylphosphatidylcholine (DPPC) Signup and view all the answers

According to the LaPlace law, what happens to the tendency for alveolar collapse during expiration?

It increases as the alveolar radius decreases Signup and view all the answers

Which type of alveolar cell is responsible for surfactant secretion?

Type II pneumocytes Signup and view all the answers

What is the primary mechanism by which surfactant prevents pulmonary edema?

By decreasing filtration forces across the alveolar-capillary membrane Signup and view all the answers