Mon Prof Augmenté
Oxygen In, Carbon Dioxide Out
Body cells need oxygen to release energy from nutrients. They produce carbon dioxide, which blood carries away.
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Age 15: open this week
Browse Age 15
In the picture
- Cell membrane: the boundary that oxygen and carbon dioxide cross.
- Blue dot: an oxygen molecule that enters the cell.
- Grey dot: a carbon dioxide molecule that leaves the cell.
- Red disc: a red blood cell that carries oxygen and carbon dioxide.
- Vessel wall: the tube that holds blood cells and dissolved gases.
Examples
- A runner’s leg muscles take in more oxygen and release more carbon dioxide during a sprint.
- Holding your breath lets carbon dioxide build up until you feel the urge to breathe.
Key takeaways
- Cells use oxygen to release energy from nutrients.
- Blood removes carbon dioxide from cells.
Carry on in the app
Three questions on this lesson. It has left the free week, so its quiz is for subscribers.
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