What is hypoxia?

What is hypoxia?

• A. A decrease in the amount of oxygen available to cells.
• B. An excess of oxygen in tissues.
• C. A reduction in carbon dioxide levels.
• D. Increased ATP production.

Answer: (A)

Hypoxia is when tissues don’t receive enough oxygen. Oxygen is needed for aerobic metabolism in cells to make ATP efficiently; when supply drops, cells can’t generate as much ATP and function is impaired. The statement describing a decrease in the amount of oxygen available to cells best captures this idea. The other ideas don’t fit: excess oxygen in tissues is hyperoxia, not hypoxia; a reduction in carbon dioxide levels describes hypocapnia and isn’t about tissue oxygenation; increased ATP production would not occur with reduced oxygen— ATP production typically falls under hypoxic conditions.

Hypoxia is when tissues don’t receive enough oxygen. Oxygen is needed for aerobic metabolism in cells to make ATP efficiently; when supply drops, cells can’t generate as much ATP and function is impaired. The statement describing a decrease in the amount of oxygen available to cells best captures this idea.

The other ideas don’t fit: excess oxygen in tissues is hyperoxia, not hypoxia; a reduction in carbon dioxide levels describes hypocapnia and isn’t about tissue oxygenation; increased ATP production would not occur with reduced oxygen— ATP production typically falls under hypoxic conditions.