Which of these causes inhalation/inspiration?
A. Contraction of the abdominal muscles
B. Alveolar pressure increasing above atmospheric pressure
C. Flattening (downward movement) of the diaphragm
D. Increase in the curvature (upward movement) of the diaphragm
E. Movement of the ribs closer together due to contraction of the internal intercostal muscles
Answer: C
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