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Questions and Answers
What is the role of arterial chemoreceptors in response to decreased PO2?
What is the role of arterial chemoreceptors in response to decreased PO2?
- Decreased ventilation
- Increased ventilation (correct)
- Increased hydrogen ion secretion
- Increased bicarbonate excretion
What is the acute effect of hypoxia experienced at 18,000ft above sea level?
What is the acute effect of hypoxia experienced at 18,000ft above sea level?
- Drowsiness and lassitude
- Headache, nausea, and euphoria
- Mental proficiency falls to about 50%
- Twitching or seizures (correct)
What is the main function of hypoxia-inducible factors (HIFs) in response to low oxygen availability?
What is the main function of hypoxia-inducible factors (HIFs) in response to low oxygen availability?
- Decrease energy utilization
- Activate genes needed for O2 delivery and energy metabolism (correct)
- Increase hydrogen ion secretion
- Activate genes needed for anaerobic metabolism
How do the kidneys respond to hypoxia?
How do the kidneys respond to hypoxia?
What is the mechanism behind the increased diffusing capacity of lungs in response to certain conditions?
What is the mechanism behind the increased diffusing capacity of lungs in response to certain conditions?
How does hyperventilation impact pH levels in the body?
How does hyperventilation impact pH levels in the body?
What does 'Ceiling' Altitude refer to in the context of the text?
What does 'Ceiling' Altitude refer to in the context of the text?
What is the primary reason breathing pure oxygen allows you to go much higher in altitude safely?
What is the primary reason breathing pure oxygen allows you to go much higher in altitude safely?
At what altitude does an aviator reach 50% oxygen saturation when breathing pure O2?
At what altitude does an aviator reach 50% oxygen saturation when breathing pure O2?
What happens to PCO2 as altitude increases?
What happens to PCO2 as altitude increases?
Why is it essential for acclimatization to occur at higher altitudes?
Why is it essential for acclimatization to occur at higher altitudes?
What changes in O2 and N2 concentration are observed at the top of Mt.Everest?
What changes in O2 and N2 concentration are observed at the top of Mt.Everest?
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