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External respiration happens where and between who? Internal respiration happens where and between who?

External respiration happens where and between who? Internal respiration happens where and between who?

Science   Anatomy-And-Physiology   
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Answer #1

External respiration - It occurs between Alveolar cells and external environment air. ( Lungs )

Internal respiration - It occurs between blood and Body cells .( Tissue ).

For ease of understanding , Let explain in the form difference between both.

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