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1431cv13 - alveoli • respiration maintains a fairly...

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13 Lungs • 4-6 litres - very large moist surface • alveoli - more than 300 million • thin walled, elastic hollow sacs • vital surface for gas exchange • millions of short, thin walled capillaries beside
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Unformatted text preview: alveoli • respiration maintains a fairly constant favorable [ ] gradient for exchange of O 2 and CO 2 between the capillaries and alveoli...
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