EMT Airway and Breathing Practice Exam

Rapid, deep breathing, also known as hyperventilation, increases the rate at which carbon dioxide is expelled from the body. When a person breathes rapidly and deeply, the exchange of gases in the lungs is heightened, allowing for more carbon dioxide to be exhaled. This can lead to a decrease in carbon dioxide levels in the arterial blood, often resulting in respiratory alkalosis due to the lowered concentration of carbon dioxide.

In contrast, actions like shallow breathing, obstructive sleep apnea, and excessive physical exertion can result in an accumulation of carbon dioxide. Shallow breathing limits the volume of air exchanged, which can trap carbon dioxide in the lungs. Obstructive sleep apnea causes repeated interruptions in breathing, leading to periods of inadequate ventilation and elevated carbon dioxide levels. During excessive physical exertion, particularly if breathing does not meet the increased demand for oxygen, carbon dioxide can build up in the bloodstream as the muscles produce more of it than can be effectively expelled.