External respiration refers to the exchange of oxygen and carbon dioxide between:
a. alveoli and bloodstream
b. outside air and cells of the body
c. bloodstream and cells
d. lungs and heart
Answer: A
External respiration refers to the exchange of oxygen and carbon dioxide between:
a. alveoli and bloodstream
b. outside air and cells of the body
c. bloodstream and cells
d. lungs and heart
Answer: A
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