Which answer places the following events in proper order for pulmonary ventilation?
a: Thoracic cavity volume changes.
b: Brainstem nuclei stimulate skeletal muscles to contract.
c: Air flows down its pressure gradient.
d: Dimensional changes in the thorax lead to pressure changes within the lung.
A. b, a, d, c
B. d, c, b, a
C. b, d, c, a
D. a, c, d, b
E. c, a, d, b
A
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