Which of the following is not true of inspiration?
A. Inspiratory reserve volume is much lower than expiratory reserve volume.
B. Enlargement of the thoracic cavity reduces the pressure in the lungs, leading to air entering the thoracic cavity.
C. Inspiration results from contraction of the diaphragm and the external intercostal muscles.
D. The anatomic dead space is about 30% of the inhaled tidal volume.
E. All of these are true of inspiration.
Answer: A
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