Even though sufficient O2 in exhaled air exists to re-breathe, CO2 % rise & low blood pH results in a feeling of suffocating.They were re-breathing the air they exhaled. This will cause higher CO2 levels even though there is enough O2 in exhaled air for you to re-breathe. pH would be low because of the increased CO2 levels from re-breathing the exhaled air. It takes high CO2 level and low blood pH to feel like you are suffocating..
Why did the Apollo 13 astronauts feel as if they were suffocating, despite having an adequate amount of oxygen?
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