Do Lungs have positive or negative pressure?
Explanation with a diagram:
Inhalation: During inspiration, intrapulmonary pressure is negative, allowing outside air to enter, and during expiration, intrapulmonary pressure becomes positive due to a decrease in pulmonary volume.
Exhalation: Even when exhaling, the pressure inside the pleural cavity around the lungs is always negative, that is, less than atmospheric pressure.
Diagram:
Final answer: The Lungs Have Positive pressure during exhalation and Negative Pressure during inhalation.