Certified Hyperbaric Technologist Practice Test

What minimum oxygen tension in mmHg is required for cells to perform normal functions?

1. 20 mmHg

2. 30 mmHg

3. 40 mmHg

4. 50 mmHg

The correct answer is: 30 mmHg

The minimum oxygen tension required for cells to perform normal functions is generally recognized to be around 30 mmHg. This level of oxygen tension is critical because it is sufficient to maintain normal cellular respiration and metabolic activities. At this range, cells can adequately utilize oxygen for energy production and various biochemical processes. Under lower oxygen tensions, such as those below 30 mmHg, cells may begin to experience hypoxia, leading to impaired function and potential cellular injury. For most tissues, particularly those that are metabolically active, maintaining oxygen levels at or above this threshold is essential for optimal physiological function. Thus, the selection of 30 mmHg aligns with established medical knowledge regarding cellular oxygen requirements.