Inhalation occurs when the:
A. diaphragm and intercostal muscles relax and cause an increase in intrathoracic pressure.
B. diaphragm and intercostal muscles ascend and cause an increase in intrathoracic pressure.
C. diaphragm and intercostal muscles contract and cause a decrease in intrathoracic pressure.
D. diaphragm ascends and the intercostal muscles contract, causing a decrease in intrathoracic pressure.
Answer: C. diaphragm and intercostal muscles contract and cause a decrease in intrathoracic pressure.
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