3494175
Question 1
Question
Airway resistance = Flow Resistance - pick the wrong statement
Answer
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Laminar flow in the acinus - low velocity and Reynolds number is low
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Trachea-bronchi - turbulent flow - high velocity and high Reynolds number
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decrease in the radii of the bronchioles in half, which increases their resistance by 4-fold
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Airway resistance is the highest in the 3rd to 5th generation bronchi
Question 2
Question
Effects of lung volume on airway diameter
Answer
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Airway resistance decreases as lung volume increases during inspiration and vice versa during expiration
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Airways are elastic so they increase diameter when Pleural pressure goes up
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This is why it takes longer to exhale during passive breathing than to inhale
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all of the above are correct
Question 3
Question
Lung volume and airflow
Answer
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Inspiration is effort dependent
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During expiration increase in effort produces increases in flow only during the initial quarter of the expiratory vital capacity
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During expiration at low and moderate lung volumes - flow is maximal and is effort independent
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all of the above are correct
Question 4
Question
At Equal Pressure Point
Answer
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When the pressure in airway is equal to pleural pressure Paw = Ppl
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During Forced expiration - Upstream of EPP (toward alveoli) driving pressure, PA-P mouth - will move air out of the lungs
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During Forced expiration - Downstream of EPP (toward mouth) PA -Ppl
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all of the above are correct
Question 5
Question
Patients with emphysema have lungs that are easy to inflate, but they don't generate enough elastic recoil pressure to get the air out which causes airways collapse and air trapping
Answer
- True
- False
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