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Aero Med > Altitude Physiology > Flashcards

Altitude Physiology Flashcards

1
Q

What is the efficient zone?

A

Sea level to 10,000 ft

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2
Q

What is the deficient zone?

A

10,000 to 50,000 ft

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3
Q

What is the space equivalent zone?

A

50,000 and above

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4
Q

At what altitude does gas expansion double?

A

18,000ft

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5
Q

What happens at 63,000ft?

A

“Blood boils” also called the Armstrong line

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6
Q

What is the composition of the air?

A

Nitrogen 78%
Oxygen 21%
Other 1%

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7
Q

What is atmospheric pressure?

A

The measurement of pressure exerted on the earths surface

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8
Q

What is the atmospheric pressure in mm hg at sea level

A

760 mm hg

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9
Q

What is boyle’s law?

A

The volume of a given gas varies inversely with its pressure at a constant temp
(Balloon expands going up)

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10
Q

What is Dalton’s law?

A

The total pressure of a gas mixture is the sum of the individual pressure of all gasses in the mixture.

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11
Q

What is Henry’s law?

A

The quantity of gas dissolved in a given volume of liquid is proportional to the partial pressure of the gas contact with the liquid.
(Decompression sickness)
Aviation Significance- increase in altitude, pressure will decrease and nitrogen will leave the body and try to equalize with the surrounding environment.

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12
Q

What are the circulatory system components?

A

Arteries, Veins and capillaries

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13
Q

Red blood cells transport approximately 98.5 of __ in the body

A

Oxygen

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14
Q

What is the hemoglobin protein?

A

Makes up 97% of the dry mass of the red blood cells and carries oxygen.

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15
Q

What are the respiratory functions?

A

Intake of oxygen, removal of Carbon dioxide and maintenance of body.

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16
Q

Where does the gas exchange happen in the lungs?

A

The alveoli

17
Q

What is the time of useful consciousness at 18k feet?

A

20-30 min

18
Q

What is hyperventilation?

A

An excessive rate of >20 breaths/min

19
Q

What is gas dysbarism?

A

Syndrome resulting from the effects, excluding hypoxia, of a pressure differential between the ambient barometric pressure and the pressure of gasses within the body.

20
Q

True or false
Wet gas expansion is 3 times more than at sea level

A

True

21
Q

What is barodontalgia?

A

Tooth pain due to change in barometric pressure

22
Q

What are the two types of decompression sickness?

A

Type 1
Bends and skin manifestation
Type 2
Chokes and central nervous system disorders

23
Q

True or false
Evolved gas disorders are considered serious and medical treatment/advice must be sought immediately

A

True

24
Q

30 minutes of pre breathing oxygen O2 removes how much Nitrogen?

A

30 %

Aero Med (11 decks)

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