ENVIRONMENTAL CONDITIONS - ALTITUDE 1 Flashcards
physiological changes in these environments
Air at any level contains how much % of
- O2
- N
- CO2
O2 = 20.93%
N = 79.04%
CO2 = 0.03%
At altitude, there is a reduction in the what?
Pressure of O2 entering the lungs
This reduces the pressure differential between the alveoli and the capillaries resulting in what?
- Resulting in less O2 diffusing from the alveoli into the blood.
Define concentration gradient
Gas exchange takes place due to a concentration difference
OXYGEN move from *what into the *what which surround them
- alveoli of the lungs
- Capillaries
CARBON DIOXIDE moves from *what into the *what to be what
- alveoli
- to be expired
OXYGEN moves from a *what to the *what where they are of *what
- high concentration in the alveoli
- to the capillaries where they are of low concentration
At sea level, O2 has a partial pressure of
159 mmHg
At Mt Everest, O2 has a partial pressure of
48mmHg
In surrounding venous blood, O2 has a partial pressure of
47mmHg at any altitude
So at sea level pressure difference is which means diffusion is what?
159-47 = 112mmHg
Diffusion is easy
So on Mt Everest pressure difference is which means diffusion is what?
48-47 = 1mmHg
Diffusion is nearly impossible