Which of the following best describes the process of ventilation?
A) the movement of oxygen gas through the blood of the circulatory system
B) the movement of carbon dioxide gas through the blood of the circulatory system
C) the movement of the respiratory medium past the respiratory surface
D) the diffusion of gases into and out of the circulatory system
E) the diffusion of gases into and out of tissues where cellular respiration occurs
Answer: C
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