Answer:
Explanation:
When intrapulmonary pressure is greater than atmospheric pressure, the air is forced out of the lungs and exhalation occurs. This is also known as expiration or exhalation.
During normal breathing, inhalation occurs when the diaphragm contracts and the ribcage expands, which creates negative pressure in the lungs. This negative pressure draws air into the lungs, and the air flows from an area of higher pressure (outside the body) to an area of lower pressure (inside the lungs).
During exhalation, the diaphragm relaxes and the ribcage returns to its original position, which decreases the volume of the lungs and increases the intrapulmonary pressure. This increased pressure forces air out of the lungs and into the atmosphere.
Overall, inhalation and exhalation are the two phases of the respiratory cycle that ensure the exchange of gases between the lungs and the environment.