Which of the following processes occurs during normal inspiration?
A. An increase in intrathoracic pressure forces air into the lungs
B. The phrenic nerves stimulate the intercostal muscles to contract
C. Air is pulled into the lungs when intrathoracic pressure decreases
D. The diaphragm contract and ascends, increasing the chest diameter
Answer: C. Air is pulled into the lungs when intrathoracic pressure decreases
Health Professions
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