A nurse explains that internal respiration occurs between the systemic capillaries and body cells. Which exchange is expected?
Correct answer: A. Oxygen moves into cells and carbon dioxide enters blood
- A. Oxygen moves into cells and carbon dioxide enters blood
- B. Oxygen enters alveoli and carbon dioxide leaves blood
- C. Nitrogen moves into cells and oxygen enters alveoli
- D. Carbon dioxide leaves cells and oxygen leaves blood
Explanation
During internal respiration, tissue cells use oxygen, so oxygen diffuses from systemic blood into cells and carbon dioxide diffuses from cells into the blood. Exchange between alveolar air and pulmonary capillary blood is external respiration.
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About Respiratory System
The respiratory system includes the air passages, lungs, pleura, alveoli and the mechanics of breathing. It explains pulmonary ventilation, gas exchange, oxygen and carbon dioxide transport, regulation of breathing, and the difference between external respiration in the lungs and internal respiration in body tissues.
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