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18-02-2017
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What are four principle functions of the respiratory system?

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ats91413 ats91413

18-02-2017

1. External respiration exchanges gases between bloodstream and lungs
2. Internal respiration exchanges gases between bloodstream and body tissue.
3. Air vibrating in vocal cords causes sound
4. Olfaction.

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18-02-2017

external is one of them

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