12 Questions
What is the role of arterial chemoreceptors in response to decreased PO2?
Increased ventilation
What is the acute effect of hypoxia experienced at 18,000ft above sea level?
Twitching or seizures
What is the main function of hypoxia-inducible factors (HIFs) in response to low oxygen availability?
Activate genes needed for O2 delivery and energy metabolism
How do the kidneys respond to hypoxia?
Increase bicarbonate excretion
What is the mechanism behind the increased diffusing capacity of lungs in response to certain conditions?
Adaptation: Angiogenesis
How does hyperventilation impact pH levels in the body?
Causes alkalosis
What does 'Ceiling' Altitude refer to in the context of the text?
The highest altitude where a person can safely go without experiencing significant problems
What is the primary reason breathing pure oxygen allows you to go much higher in altitude safely?
Your blood carries more oxygen
At what altitude does an aviator reach 50% oxygen saturation when breathing pure O2?
23,000ft
What happens to PCO2 as altitude increases?
PCO2 decreases
Why is it essential for acclimatization to occur at higher altitudes?
To adjust to lower oxygen levels as altitude increases
What changes in O2 and N2 concentration are observed at the top of Mt.Everest?
$1/5$ O2 and $4/5$ N2
Test your knowledge on barometric pressure, air pressure, gas unit conversions, and factors affecting gas composition like altitude and gas dilution. Understand the impact of different gas mixtures on oxygen saturation levels.
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