Inhalation occurs when the diaphragm and intercostal muscles contract and cause a decrease in intrathoracic pressure. This describes:

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Multiple Choice

Inhalation occurs when the diaphragm and intercostal muscles contract and cause a decrease in intrathoracic pressure. This describes:

Explanation:
Inhalation begins when the diaphragm contracts and moves downward while the external intercostal muscles lift the ribs, expanding the thoracic cavity. This increase in volume lowers the intrathoracic pressure below atmospheric pressure, causing air to flow into the lungs. So the scenario describes a decrease in intrathoracic pressure, which is what drives inhalation. The other possibilities don’t fit: increasing pressure would push air out, no change wouldn’t draw air in, and an unpredictable change isn’t how this controlled process works.

Inhalation begins when the diaphragm contracts and moves downward while the external intercostal muscles lift the ribs, expanding the thoracic cavity. This increase in volume lowers the intrathoracic pressure below atmospheric pressure, causing air to flow into the lungs. So the scenario describes a decrease in intrathoracic pressure, which is what drives inhalation. The other possibilities don’t fit: increasing pressure would push air out, no change wouldn’t draw air in, and an unpredictable change isn’t how this controlled process works.

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