Negative-pressure ventilation occurs when:
A) the diaphragm ascends and the intercostal muscles retract.
B) air is drawn into the lungs when intrathoracic pressure decreases.
C) pressure within the chest decreases and air is forced from the lungs.
D) the phrenic nerves stop sending messages to the diaphragm.
Answer: B) air is drawn into the lungs when intrathoracic pressure decreases.
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