Which of the following does not occur during the stage of ventilation depicted in the following diagram?

The given diagram depicts inspiration. During expiration, intra-pulmonary pressure is more than atmospheric pressure.

During inspiration:

• External intercostal muscles and diaphragm contract.
• Ribs and sternum are raised and diaphragm is flattened.
• As the intrapulmonary volume increases, intrapulmonary pressure decreases. It becomes less than atmospheric pressure.
• Air moves in.