Carbon dioxide from the yeast comes from a process called fermentation. Fermentation is a cellular respiration process in cells that happens when oxygen is not present. If oxygen is present, the process is called aerobic respiration.
Depending on baseline oxygen saturation and the pathological condition of the lungs, risks associated with altitude exposure include profound hypoxemia, pulmonary hypertension, disordered ventilatory control, impaired respiratory muscle function, and sleep‐disordered breathing.
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