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Atmospheric Pressure and Gas Composition Quiz

12 Questions

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Atmospheric Pressure and Gas Composition Quiz

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Questions and Answers

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?

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?

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?

Increase bicarbonate excretion Signup and view all the answers

What is the mechanism behind the increased diffusing capacity of lungs in response to certain conditions?

Adaptation: Angiogenesis Signup and view all the answers

How does hyperventilation impact pH levels in the body?

Causes alkalosis Signup and view all the answers

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 Signup and view all the answers

What is the primary reason breathing pure oxygen allows you to go much higher in altitude safely?

Your blood carries more oxygen Signup and view all the answers

At what altitude does an aviator reach 50% oxygen saturation when breathing pure O2?

23,000ft Signup and view all the answers

What happens to PCO2 as altitude increases?

PCO2 decreases Signup and view all the answers

Why is it essential for acclimatization to occur at higher altitudes?

To adjust to lower oxygen levels as altitude increases Signup and view all the answers

What changes in O2 and N2 concentration are observed at the top of Mt.Everest?

$1/5$ O2 and $4/5$ N2 Signup and view all the answers