L3 Compliance and Work of Breathing

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Which of the following factors decreases the work of breathing?

Bronchial asthma

Decreased intrapleural pressure (correct)

Chest deformity

Lung diseases

Pulmonary compliance increases in which of the following conditions?

Chest deformity

Lung fibrosis

Emphysema (correct)

Obesity

Which of the following is NOT a cause of increased work of breathing?

Decreased airway resistance (correct)

Increased surface tension due to decreased surfactant secretion

Diseases of the lung

Narrowing of the air passages

What is the definition of pulmonary compliance?

The change in lung volume per unit change in transpulmonary pressure Signup and view all the answers

What is the definition of hysteresis in the context of the pressure-volume loop?

The difference in the shape of the pressure-volume loop between inspiration and expiration Signup and view all the answers

Which of the following conditions is accompanied by decreased pulmonary compliance?

Lung fibrosis Signup and view all the answers

What is the definition of airway resistance?

The change in airflow per unit change in transpulmonary pressure Signup and view all the answers

Which of the following factors increases airway resistance?

Bronchial asthma Signup and view all the answers

What percentage of the total work of breathing is attributed to overcoming airway resistance?

28% Signup and view all the answers

What is the main function of the intrapleural pressure?

To provide the driving force for breathing Signup and view all the answers

Where is surfactant secreted from?

Alveolar epithelial cells Signup and view all the answers

What is the main function of surfactant?

To reduce the work of breathing Signup and view all the answers

What is the definition of compliance?

The ratio between the change in volume and the change in distending pressure Signup and view all the answers

What is the definition of hysteresis?

The relationship between pressure and volume during inspiration and expiration Signup and view all the answers

What condition is associated with increased lung compliance?

Emphysema Signup and view all the answers

What factors can decrease thoracic wall compliance?

Deformity of the thoracic wall, arthritis, and skeletal muscle diseases Signup and view all the answers

What is the primary factor that increases airway resistance?

Increased airway diameter Signup and view all the answers

What effect does the parasympathetic nervous system have on the bronchial smooth muscle?

Contraction Signup and view all the answers

How does bronchodilation affect airway resistance?

Decreases resistance Signup and view all the answers

L3 Compliance and Work of Breathing

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Questions and Answers

Which of the following factors decreases the work of breathing?

Pulmonary compliance increases in which of the following conditions?

Which of the following is NOT a cause of increased work of breathing?

What is the definition of pulmonary compliance?

What is the definition of hysteresis in the context of the pressure-volume loop?

Which of the following conditions is accompanied by decreased pulmonary compliance?

What is the definition of airway resistance?

Which of the following factors increases airway resistance?

What percentage of the total work of breathing is attributed to overcoming airway resistance?

What is the main function of the intrapleural pressure?

Where is surfactant secreted from?

What is the main function of surfactant?

What is the definition of compliance?

What is the definition of hysteresis?

What condition is associated with increased lung compliance?

What factors can decrease thoracic wall compliance?

What is the primary factor that increases airway resistance?

What effect does the parasympathetic nervous system have on the bronchial smooth muscle?

How does bronchodilation affect airway resistance?

Which part of the work of breathing involves overcoming the viscosity of lung and chest wall structures?

What is the impact of bronchoconstriction on air flow?

Why is epinephrine injected to treat bronchial asthma?

What is responsible for 65% of the work of breathing?

What causes bronchial constriction?

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