100+ 1 st subunit PowerPoint (PPT) Presentations, 1 st subunit PPTs

1 st subunit - PowerPoint PPT Presentation

Why do we need a respiratory system?

food. O 2. ATP. CO 2. Why do we need a respiratory system?. Need O 2 in for aerobic cellular respiration make ATP Need CO 2 out waste product from Krebs cycle. Gas exchange. O 2 & CO 2 exchange between environment & cells need moist membrane need high surface area Why?.

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1 st subunit - PowerPoint PPT Presentation

Why do we need a respiratory system?