18 Questions
What is the term used to describe the volume of air entering or leaving the lungs during one breath?
Tidal volume
What is a major function of pseudostratified columnar ciliated epithelium in the upper respiratory tract?
Trap dust particles in incoming air
What happens to airway resistance in conditions like asthma?
Increased respiratory rate
What is the smallest airway of the conducting zone in the respiratory system?
Terminal bronchioles
What is a characteristic of gas exchange in the respiratory system?
Directly proportional to the solubility coefficient and inversely proportional to the quantity
Which term describes the volume of air moved into or out of the lungs during normal breathing?
Tidal volume
What percentage of muscle fibers associated with a motor unit are activated during isokinetic contraction?
100%
In a spirometry test, what does a high FEV1/FVC ratio indicate?
Normal lung function
Which of the following pulmonary function tests provides information on gas exchange efficiency?
Single breath carbon monoxide diffusing capacity (transfer factor)
What can a spirometer NOT measure directly?
Alveolar ventilation
In respiratory physiology, what is the product of tidal volume and respiratory frequency known as?
Dead space volume
What would a low FEV1 value in a spirometry test indicate?
Chronic bronchitis
What is the ambient partial pressure of oxygen (pO2) at the summit of Mount Everest where the pressure of dry atmospheric air is 231mmHg?
48 mmHg
During inspiration, which pressure rises?
Intrathoracic pressure
What happens to the intrapulmonary pressure during the initial phase of inspiration?
Intrapulmonary pressure falls
At the end of inspiration, where does the alveolar gas pressure (when there is no airflow) equilibrate?
Intrapleural pressure
During expiration, which pressure falls?
All of the above
When CO2 diffuses into blood in systemic capillaries, what happens to most of it?
Is converted to bicarbonate in red blood cells
Test your knowledge of the respiratory system with this quiz on gas solubility, airway anatomy, and related terms. Determine which statements are true regarding the quantity of gas dissolved, solubility coefficient, and the smallest airways in the conducting zone.
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