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Questions and Answers
What happens to the percentage of Oxygen in the atmosphere as altitude increases?
What happens to the percentage of Oxygen in the atmosphere as altitude increases?
- Increases with an increase in altitude
- Remains constant up to approximately 70 000 feet
- Decreases with an increase in altitude (correct)
- Remains constant up to approximately 33 700 feet
At approximately what altitude is the atmospheric pressure half the sea-level value?
At approximately what altitude is the atmospheric pressure half the sea-level value?
- 10 000 feet
- 12 000 feet
- 33 000 feet
- 18 000 feet (correct)
Up to what altitude can a healthy pilot operate without suffering the effects of hypoxia?
Up to what altitude can a healthy pilot operate without suffering the effects of hypoxia?
- 10 000 feet
- 20 000 feet
- 16 000 feet (correct)
- 18 000 feet
At what altitude does the percentage of Oxygen in the atmosphere remain at 21%, by volume?
At what altitude does the percentage of Oxygen in the atmosphere remain at 21%, by volume?
Why do pilots need to breathe supplementary Oxygen when flying at high altitude?
Why do pilots need to breathe supplementary Oxygen when flying at high altitude?
What are the respective percentages of the gases that make up the atmosphere?
What are the respective percentages of the gases that make up the atmosphere?
At 36,000 feet, the air pressure is:
At 36,000 feet, the air pressure is:
Breathing is regulated by:
Breathing is regulated by:
A smoker will feel the symptoms of hypoxia (Oxygen starvation) at:
A smoker will feel the symptoms of hypoxia (Oxygen starvation) at:
On average, how long does it take to eliminate one unit of alcohol from the blood?
On average, how long does it take to eliminate one unit of alcohol from the blood?
The mechanism that maintains a constant flow of blood around the body is called:
The mechanism that maintains a constant flow of blood around the body is called:
How long after prolonged breathing-in of Carbon Monoxide must a pilot refrain from flying?
How long after prolonged breathing-in of Carbon Monoxide must a pilot refrain from flying?
Angina is caused by:
Angina is caused by:
Carbon monoxide is dangerous because:
Carbon monoxide is dangerous because:
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Study Notes
Altitude and Atmospheric Conditions
- The percentage of Oxygen in the atmosphere remains at 21% by volume, regardless of altitude.
- Atmospheric pressure decreases with altitude, with the pressure being half the sea-level value at approximately 18,000 feet.
Pilot Health and Hypoxia
- A healthy pilot can operate without suffering the effects of hypoxia up to an altitude of approximately 12,000-13,000 feet.
- Pilots need to breathe supplementary Oxygen when flying at high altitude to avoid hypoxia (Oxygen starvation).
- A smoker will feel the symptoms of hypoxia (Oxygen starvation) at a lower altitude than a non-smoker.
Atmospheric Composition
- The atmosphere is composed of:
- Nitrogen: 78%
- Oxygen: 21%
- Other gases: 1%
Human Physiology
- Breathing is regulated by the respiratory center in the brain.
- On average, it takes one hour to eliminate one unit of alcohol from the blood.
Cardiovascular System
- The mechanism that maintains a constant flow of blood around the body is called the cardiovascular system.
- Angina is caused by a lack of Oxygen supply to the heart muscle.
Toxicology
- Carbon monoxide is dangerous because it binds to hemoglobin in the blood, reducing the Oxygen-carrying capacity of the blood.
- A pilot must refrain from flying for at least 24 hours after prolonged breathing-in of Carbon Monoxide.
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