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Air enters the lungs after traveling througha series of respiratory airways -gas exchange between the lungs and the circulatory system occurs across the very thin walls of the alveol -primary function is to provide the necessary energy for growth - m

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1. Air enters the lungs after traveling througha series of respiratory airways -gas exchange between the lungs and the circulatory system occurs across the very thin walls of the alveol -primary function is to provide the necessary energy for growth - m





 
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