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Questions and Answers
What is the approximate compliance of the lungs alone when removed from the body at a pressure of 1 cmH2o?
What is the approximate compliance of the lungs alone when removed from the body at a pressure of 1 cmH2o?
- 0.1 liter
- 0.2 liter (correct)
- 0.5 liter
- 0.05 liter
What is the main factor limiting the expansibility of the lungs in the chest?
What is the main factor limiting the expansibility of the lungs in the chest?
- Collagen fibers
- Rigid thoracic cage (correct)
- Elastic forces of the lung tissue
- Surface tension of the fluid lining the alveoli
What happens to the elastin and collagen fibers when the lungs expand?
What happens to the elastin and collagen fibers when the lungs expand?
- They become more stretched and unkinked (correct)
- They are compressed
- They remain in the same state
- They become more kinked
What is the approximate difference in pressure required to expand air-filled lungs compared to saline solution-filled lungs?
What is the approximate difference in pressure required to expand air-filled lungs compared to saline solution-filled lungs?
What is the main reason for the difference in pressure required to expand air-filled lungs and saline solution-filled lungs?
What is the main reason for the difference in pressure required to expand air-filled lungs and saline solution-filled lungs?
What is the state of the elastin and collagen fibers in deflated lungs?
What is the state of the elastin and collagen fibers in deflated lungs?
What is the approximate volume of air inspired or expired with each normal breath in an adult male?
What is the approximate volume of air inspired or expired with each normal breath in an adult male?
What is the term for the volume of air remaining in the lungs after the most forceful expiration?
What is the term for the volume of air remaining in the lungs after the most forceful expiration?
What is the clinical importance of the minimal air or volume?
What is the clinical importance of the minimal air or volume?
At what conditions are pulmonary volumes and capacities expressed?
At what conditions are pulmonary volumes and capacities expressed?
What is the maximum extra volume of air that can be inspired over and above the normal tidal volume?
What is the maximum extra volume of air that can be inspired over and above the normal tidal volume?
Why is the inspiratory reserve volume usually equal to about 3000 milliliters?
Why is the inspiratory reserve volume usually equal to about 3000 milliliters?
What is the effect of increased BPG in the blood on the oxygen-hemoglobin dissociation curve?
What is the effect of increased BPG in the blood on the oxygen-hemoglobin dissociation curve?
What is the result of increased 2-3 DPG in the red blood cells?
What is the result of increased 2-3 DPG in the red blood cells?
Which of the following factors does not increase 2-3 DPG synthesis?
Which of the following factors does not increase 2-3 DPG synthesis?
What is the role of 2-3 DPG in the adaptation to hypoxia?
What is the role of 2-3 DPG in the adaptation to hypoxia?
What is the effect of high altitude on 2-3 DPG synthesis?
What is the effect of high altitude on 2-3 DPG synthesis?
What is the result of the combination of 2-3 DPG with beta polypeptide chains of Hb A?
What is the result of the combination of 2-3 DPG with beta polypeptide chains of Hb A?
What can decrease the vital capacity (VC) in the recumbent position?
What can decrease the vital capacity (VC) in the recumbent position?
Why is the vital capacity (VC) greater in athletes than in sedentary people?
Why is the vital capacity (VC) greater in athletes than in sedentary people?
What is the term for diseases that limit the lung or thoracic wall expansibility?
What is the term for diseases that limit the lung or thoracic wall expansibility?
What is the primary cause of reduced lung elasticity in emphysema?
What is the primary cause of reduced lung elasticity in emphysema?
What occurs during expiration in obstructive lung diseases such as asthma?
What occurs during expiration in obstructive lung diseases such as asthma?
What is the term for the collection of air in the pleural sac?
What is the term for the collection of air in the pleural sac?
What is the primary reason for the decrease in oxygen partial pressure from 159 mm Hg in atmospheric air to 149 mm Hg in humidified air?
What is the primary reason for the decrease in oxygen partial pressure from 159 mm Hg in atmospheric air to 149 mm Hg in humidified air?
What is the volume of new air brought into the alveoli with each normal inspiration?
What is the volume of new air brought into the alveoli with each normal inspiration?
What is the approximate percentage of oxygen in atmospheric air?
What is the approximate percentage of oxygen in atmospheric air?
What is the partial pressure of carbon dioxide in expired air?
What is the partial pressure of carbon dioxide in expired air?
Why does the alveolar air need to be exchanged multiple times?
Why does the alveolar air need to be exchanged multiple times?
What is the total partial pressure of the respiratory gases in the alveoli?
What is the total partial pressure of the respiratory gases in the alveoli?
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