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Card 10 / 29:
How can a decrease in the percent of oxygen in the air affect the movement of oxygen in the body?
Oxygen moves from the lung to the bloodstream to the tissues according to the pressure gradient. This is measured as the partial pressure of oxygen. If the amount of oxygen drops in the inspired air, there would be reduced partial pressure. This would decrease the driving force that moves the oxygen into the blood and into the tissues. P O 2 is also reduced at high elevations: P O 2 at high elevations is lower than at sea level because the total atmospheric pressure is less than atmospheric pressure at sea level.
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