Untreated respiratory injuries can cause other body systems to fail due to lack of oxygen.

• A. Other Body Systems May Fail Due To Lack Of Oxygen
• B. They Have No Effect
• C. Only The Lungs Are Affected
• D. Oxygen Is Not Essential

Answer: (A)

Oxygen delivery is essential for every cell in the body, so when respiratory injuries impair gas exchange, tissues throughout the body become starved of oxygen. When cells can’t get enough oxygen, they lose the ability to generate energy efficiently, rely more on anaerobic metabolism, and can develop lactic acidosis. This systemic oxygen deficit can lead to dysfunction and failure in multiple organs—brain, heart, kidneys, and others—not just the lungs. That’s why untreated respiratory injuries can precipitate broader organ failure.

Options suggesting no systemic effect, effects limited to the lungs, or that oxygen isn’t essential don’t fit physiology. Oxygen is fundamental to cellular respiration, and lack of it affects all organ systems, which is why the correct idea is that other body systems may fail due to lack of oxygen.