Grades 6, 7 and 8 - Science - Middle School - Respiration — Flashcards | Middle School | FatSkills

Grades 6, 7 and 8 - Science - Middle School - Respiration — Flashcards

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Respiration is the process by which oxygen is delivered from the environment to the cells for cellular exchange. In its proper terminology, it includes the entire process. In terms of visibility, respiration is simply a term for breathing. When breathing (respiration) takes place, oxygen is taken in from the air and carbon dioxide and water vapor are breathed out...
 

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The percentage of oxygen in the air breathed in is .......
21%
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