alleryStart learning →Which definition of internal respiration is correct?
AGas exchange between alveoli and the outside air
BGas exchange between blood and the body tissues
CGas exchange between alveoli and the capillaries
DThe production of ATP inside the body tissues
Answer & Solution
Correct answer: B. Gas exchange between blood and the body tissues
1. Gas exchange happens at two sites: the lungs and the tissues.
2. External respiration is exchange with the external environment and occurs in the alveoli.
3. Internal respiration is exchange with the internal environment and occurs in the tissues.
4. The third option describes external respiration, so it names the wrong site.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.4 Gas Exchange_
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