Factors affecting lung ventilation and compliance

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Questions and Answers

Which of the following describes the interaction between the lung and chest wall during expiration?

  • The lung and chest wall both recoil outward
  • The lung recoils inward while the chest wall recoils outward (correct)
  • The lung and chest wall both recoil inward
  • The lung and chest wall do not interact during expiration

What is the intrapleural pressure in the pleural cavity under normal conditions?

  • 0cmH2O
  • +5cmH2O
  • -5cmH2O (correct)
  • -10cmH2O

What happens to the lung during pneumothorax?

  • The lung remains unaffected
  • The lung becomes more elastic
  • The lung collapses (correct)
  • The lung expands

What is the purpose of lung expansion in creating a pressure gradient for air flow?

<p>To promote gas exchange in the alveoli (C)</p> Signup and view all the answers

Which type of pneumothorax is characterized by the accumulation of air in the pleural cavity without any external injury or trauma?

<p>Spontaneous pneumothorax (A)</p> Signup and view all the answers

Which of the following is NOT a general sign or symptom of pneumothorax?

<p>Headache (B)</p> Signup and view all the answers

What clinical result is dependent on the degree of collapse on the affected side in pneumothorax?

<p>Tracheal deviation (D)</p> Signup and view all the answers

Which condition can be a potential cause of pneumothorax?

<p>All of the above (D)</p> Signup and view all the answers

Which of the following is a common sign of haemothorax?

<p>Tracheal deviation to affected side (C)</p> Signup and view all the answers

What happens if haemothorax is left untreated?

<p>Blood accumulation puts pressure on the mediastinum and trachea (D)</p> Signup and view all the answers

What percentage of a person's blood volume can the thorax hold?

<p>30-40% (D)</p> Signup and view all the answers

What is the most common cause of haemothorax?

<p>Trauma (C)</p> Signup and view all the answers

Which symptom is commonly associated with haemothorax?

<p>Dyspnea (A)</p> Signup and view all the answers

What clinical finding indicates tracheal deviation in a patient with haemothorax?

<p>Unequal chest rise (C)</p> Signup and view all the answers

How does haemothorax limit the heart's ability to fill with blood?

<p>By putting pressure on the mediastinum (C)</p> Signup and view all the answers

Which of the following contributes to the elastic recoil of the lung along with the elastin and collagen fibers found in the alveolar wall?

<p>Surface tension (B)</p> Signup and view all the answers

According to Laplace's law, which of the following has a high collapsing pressure?

<p>An alveolus with small radius (A)</p> Signup and view all the answers

What is the relationship between the collapsing pressure and the surface tension according to Laplace's law?

<p>Directly proportional (C)</p> Signup and view all the answers

What effect does surface tension have on the alveoli?

<p>It reduces alveolar compliance (B)</p> Signup and view all the answers

Why does an alveolus with a high collapsing pressure require more force to keep it open for gas exchange?

<p>It increases surface tension (A)</p> Signup and view all the answers

Which of the following is NOT a component of pulmonary surfactant?

<p>Collagen fibers (C)</p> Signup and view all the answers

What is the main function of pulmonary surfactant?

<p>To prevent alveolar collapse (D)</p> Signup and view all the answers

What is the role of alveolar interdependence in stabilizing the alveoli?

<p>To prevent alveolar collapse (D)</p> Signup and view all the answers

What happens if a newborn lacks pulmonary surfactant?

<p>Respiratory distress syndrome (B)</p> Signup and view all the answers

What is the main factor responsible for the pressure difference between smaller and larger alveoli according to Laplace's law?

<p>Surface tension (B)</p> Signup and view all the answers

Which of the following best describes the role of interdependence in preventing alveolar collapse?

<p>Interdependence stabilizes the alveoli, balancing the recoil force. (D)</p> Signup and view all the answers

What is the main cause of alveolar collapse in isolated alveoli?

<p>A relative lack of pulmonary surfactant. (C)</p> Signup and view all the answers

What happens to alveoli with a relative lack of pulmonary surfactant?

<p>They collapse spontaneously. (D)</p> Signup and view all the answers

Which type of cells produce pulmonary surfactant?

<p>Type II alveolar epithelial cells (B)</p> Signup and view all the answers

Which factor is responsible for preventing alveolar collapse in the presence of varying alveolar sizes?

<p>Interdependence of alveoli (C)</p> Signup and view all the answers

Which factor contributes the most to the work of breathing during inspiration?

<p>Elastic recoil of lungs and thorax (A)</p> Signup and view all the answers

What is the conventional measure of the ability of distension of the lungs?

<p>Compliance (B)</p> Signup and view all the answers

Which condition is characterized by increased lung compliance and flabby lungs?

<p>Emphysema (B)</p> Signup and view all the answers

What factor decreases lung compliance?

<p>Surface tension (B)</p> Signup and view all the answers

Which condition is characterized by decreased lung compliance and rigid lungs?

<p>Pulmonary fibrosis (D)</p> Signup and view all the answers

What is the relationship between lung compliance and elasticity?

<p>Lung compliance and elasticity are inversely proportional. (B)</p> Signup and view all the answers

Which factor contributes to decreased lung compliance?

<p>Increased elasticity of the lung (A)</p> Signup and view all the answers

What effect does surface tension have on lung compliance?

<p>Surface tension decreases lung compliance. (B)</p> Signup and view all the answers

Which factor directly affects lung compliance by altering intrapleural pressure?

<p>Gravity (A)</p> Signup and view all the answers

Which factor contributes to increased lung compliance in the lower section of the lungs?

<p>Effect of gravity (C)</p> Signup and view all the answers

What effect does pulmonary congestion or pulmonary edema have on lung compliance?

<p>Decreased compliance (B)</p> Signup and view all the answers

Severe kyphoscoliosis can lead to significant rib distortion and respiratory dysfunction. What happens to respiratory impairment with age?

<p>It increases (C)</p> Signup and view all the answers

Which gender is more affected by restrictive lung disease in terms of both prevalence and severity?

<p>Females (B)</p> Signup and view all the answers

Which of the following conditions is characterized by the accumulation of air in the pleural cavity without any external injury or trauma?

<p>Pneumothorax (A)</p> Signup and view all the answers

What physical examination feature is important in identifying hemothorax?

<p>Dull resonance (B)</p> Signup and view all the answers

How is compliance defined?

<p>Change in volume produced by a change in pressure (B)</p> Signup and view all the answers

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