单词	external respiration
释义	external respiration noun : exchange of gases between the external environment and a distributing system of the animal body (such as the lungs of higher vertebrates or the tracheal tubes of insects) or between the alveoli of the lungs and the blood compare internal respiration Word History First Known Use 1940, in the meaning defined above Medical Definition external respiration noun : exchange of gases between the external environment and a distributing system of the animal body (as the lungs of higher vertebrates or the tracheal tubes of insects) or between the alveoli of the lungs and the blood compare internal respiration
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