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Originally Posted by bicycle racer i dont think thats how it works. does anyone actually know how mammal respiration works with regard to what goes in as opposed to what comes out. i know about 18% of oxygen is used by the body per breath and a significant amount is unused and exhaled. what are the actual contents of exhaled breath from a mammal as oppposed to the contents when inhaled. anybody really know about this?  |
anyone that took 7th grade biology should know... but ill break it down for you..
cellular respiration.. oxygen and glucose consumed by cells and give off water, carbon dioxide (co2) and energy.
physiologic respiration (aka breathing).. moving air in and carbon dioxide out.
you breathe not only to take in oxygen but also to expel co2, a byproduct of all your cells doing their jobs.
plants work just the opposite. they breathe in co2 and exhale oxygen.