The Heimlich maneuver is a series of pushing motions on the area just under the diaphragm that helps a person whose airway is blocked. Which best explains how this maneuver helps unblock a person's airway?

A. Pushing the diaphragm causes air to flow out of the lungs, which pushes the blockage out.
B. Pushing the diaphragm causes blood to rush to the area that pushes the blockage out.
C. Pushing the diaphragm allows the brain to produce hormones that push the blockage out.
D. Pushing the diaphragm causes a person's ribs to contract, which pushes the blockage out.

The Heimlich maneuver helps unblock a person's airway by pushing the diaphragm upward, which causes an increase in pressure inside the lungs. This pressure change assists in expelling the blockage out of the airway. When the diaphragm contracts during forced expiration, it pushes upward, compressing the thoracic cavity and forcing air out. Additionally, the action of the diaphragm pushing against the lungs creates a high-pressure environment that aids in dislodging the blockage.

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