Answered

External respiration is:

A. only exhalation

B. the passage of air through the upper respiratory tract

C. the exchange of gases in the alveoli

D. inhalation followed by exhalation



Answer :

GinnyAnswer

Final answer:

External respiration involves gas exchange in the alveoli, moving oxygen into the blood and carbon dioxide out.


Explanation:

External respiration is the exchange of gases in the alveoli where oxygen moves into the blood and carbon dioxide moves out. This process occurs due to differences in partial pressures of gases between the alveoli and blood.


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