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What are four principle functions of the respiratory system?
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What are four principle functions of the respiratory system?

User Vinczemarton
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external  is one of them
User Angel OfDemons
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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.
User Woestijnrog
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