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Barometric pressure
The pressure exerted by the weight of the atmosphere on a given surface. At sea level it is approximately 760 mmHg, and it falls as altitude rises.
Erythropoietin
A hormone released by the kidneys that stimulates red blood cell production in response to low oxygen levels.
Hypoxia
A condition in which the body or a tissue is exposed to insufficient oxygen, typically caused by low atmospheric oxygen at altitude or by impaired oxygen delivery.
Partial pressure of oxygen (PO₂)
The portion of total atmospheric pressure contributed by oxygen molecules. At sea level it is about 159 mmHg, roughly 21% of the total 760 mmHg barometric pressure.