22. Respiratory System
Lower Respiratory System
Problem 3
Textbook Question
Textbook QuestionAir moves into the lungs because (a) the gas pressure in the lungs is less than atmospheric pressure, (b) the volume of the lungs decreases with inspiration, (c) the thorax is muscular, (d) contraction of the diaphragm decreases the volume of the thoracic cavity, (e) the respiratory control center initiates active expansion of the thorax.
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