ENVIRONMENTAL CONDITIONS - ALTITUDE 1 Flashcards

physiological changes in these environments

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1
Q

Air at any level contains how much % of

  • O2
  • N
  • CO2
A

O2 = 20.93%
N = 79.04%
CO2 = 0.03%

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2
Q

At altitude, there is a reduction in the what?

A

Pressure of O2 entering the lungs

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3
Q

This reduces the pressure differential between the alveoli and the capillaries resulting in what?

A
  • Resulting in less O2 diffusing from the alveoli into the blood.
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4
Q

Define concentration gradient

A

Gas exchange takes place due to a concentration difference

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5
Q

OXYGEN move from *what into the *what which surround them

A
  • alveoli of the lungs
  • Capillaries
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6
Q

CARBON DIOXIDE moves from *what into the *what to be what

A
  • alveoli
  • to be expired
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7
Q

OXYGEN moves from a *what to the *what where they are of *what

A
  • high concentration in the alveoli
  • to the capillaries where they are of low concentration
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8
Q

At sea level, O2 has a partial pressure of

A

159 mmHg

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9
Q

At Mt Everest, O2 has a partial pressure of

A

48mmHg

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10
Q

In surrounding venous blood, O2 has a partial pressure of

A

47mmHg at any altitude

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11
Q

So at sea level pressure difference is which means diffusion is what?

A

159-47 = 112mmHg
Diffusion is easy

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12
Q

So on Mt Everest pressure difference is which means diffusion is what?

A

48-47 = 1mmHg
Diffusion is nearly impossible

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