What is the average air pressure of a human's lungs?
The average pressure of the air in the lungs varies throughout the respiratory cycle, but at rest, the air pressure inside the lungs is close to the outside atmospheric pressure, which is around 760 millimeters of mercury (mm Hg) at sea level. During inhalation, the diaphragm contracts and creates a negative pressure inside the thoracic cavity, causing air to flow into the lungs. During exhalation, the diaphragm relaxes and the lung tissue recoils, increasing the air pressure inside the lungs and causing air to flow out.
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### Instruction:
What is the average air pressure of a human's lungs?

### Response:
The average pressure of the air in the lungs varies throughout the respiratory cycle, but at rest, the air pressure inside the lungs is close to the outside atmospheric pressure, which is around 760 millimeters of mercury (mm Hg) at sea level. During inhalation, the diaphragm contracts and creates a negative pressure inside the thoracic cavity, causing air to flow into the lungs. During exhalation, the diaphragm relaxes and the lung tissue recoils, increasing the air pressure inside the lungs and causing air to flow out.