Talk:Breathing/Archive 2

Archive 1

Archive 2

External links modified

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‘Invention’ of breathing????

A highly dubious statement, without a reference. Breathing could not have evolved (or been ‘invented’) 3.44 billion years ago — the Great Oxygenation Event did not begin until 2.4 billion years ago! DrJonJ (talk) 23:21, 4 February 2020 (UTC)

Autonomous breathing

Fully autonomous breathing only takes place while sleeping. While awake, breathing is a conscious decision. Every breath takes place on demand. The breathing rate can be overriden by the brain to a certain extent during extenuating circumstances such as when exercising. — Preceding unsigned comment added by 92.21.15.48 (talk) 16:29, 26 February 2020 (UTC)

Composition

The gas exhaled is 4% to 5% by volume of carbon dioxide, about a 100 fold increase over the inhaled amount. The volume of oxygen is reduced by a small amount, 4% to 5%, compared to the oxygen inhaled.

This is wrong, or at least misleading: if inhaled air contains 21%, and exhaled air 13.6% to 16% oxygen, exhaled air contains 24% to 35% less oxygen than inhaled air (although that might confuse some readers. Perhaps "one fourth to one third less oxygen"?)

Also, because water vapor is included, the values listed under "typical composition" add up to more than 100%. Maybe it would be better to mention the water content elsewhere (not in the list) so the values add up to 100%. Prevalence 20:37, 27 November 2020 (UTC)