Exam 2: Module 5 Formative Quiz Flashcards
Compliance of the respiratory system describes:
The distensibility of the lungs and chest wall
What is the likely most significant consequence of a pneumothorax?
A. Increased arterial PO2
B. Chest wall compression
C. Decreased pleural pressure
D. Atelectasis
E. Increased alveolar pressure
D. Atelectasis
The type II alveolar cells of the lung are directly responsible for what?
Production of pulmonary surfactant
Calculate VA (ml/min) given:
Tidal volume is 250 ml/breath, breathing frequency = 32 b/m, and dead space is 150 ml.
3200 ml/min
Which statement about total cross-sectional area is true?
A. It is greater at the trachea than at the alveoli
B. When it is low then the compliance of the structure is high
C. It is less at the trachea, compared to the alveoli
D. It is increased during pneumothorax
E. It varies inversely with the magnitude of the airway generation number
C. It is less at the trachea, compared to the alveoli
Which of the following is true about alveolar surface tension forces?
A. They are offset by a substance produced and secreted from type 1 pneumocytes
B. They are associated with the gas-fluid interface
C. They exert their greatest effect when the lung is maximally inflated
D. They are a distending pressure
E. They are most powerful (greatest magnitude of effect) in the pleural cavity
B. They are associated with the gas-fluid interface
During which period of a normal, resting breathing cycle is alveolar pressure less than intrapleural pressure?
A. During exhalation, but not inspiration
B. During a pneumothorax
C. During inspiration, but not exhalation
D. Throughout the entire ventilation cycle
E. At no time during a normal breathing cycle
E. At no time during a normal breathing cycle
What is the most reasonable explanation for the presence of negative pressure within the pleural space at end exhalation during normal quiet breathing?
A. Intrapleural space tension forces
B. Outward acting elastic recoil of the lung
C. Outward acting recoil of the lung opposes the inward acting recoil of chest wall
D. The pleural pressure is only positive during inhalation
E. Inward acting recoil of the lung opposes the outward acting recoil of chest wall
E. Inward acting recoil of the lung opposes the outward acting recoil of chest wall
Pneumothorax would be LEAST LIKELY to _______
A. Cause dyspnea
B. Decrease the work of breathing
C. Decrease how much oxygen is in the bloodstream
D. Be a cause of respiratory distress
E. Increase the work of breathing
B. Decrease the work of breathing
Which statement is true concerning the pressure-volume curves for lung and chest wall?
A. Total pressure is negative at FRC
B. Total pressure is positive at high volumes
C. Total pressure is less than chest wall pressure at volumes greater than 80% VC
D. The chest wall transmural pressure is intrapulmonary pressure plus intrapleural pressure
E. Total pressure is positive at small volumes
B. Total pressure is positive at high volumes
The contraction of inspiratory muscles ________ intrathoracic volume and ________ intrapleural pressure.
Increases, decreases
