Which term describes reduced oxygen content of arterial blood due to lower ambient pressure at altitude?

Which term describes reduced oxygen content of arterial blood due to lower ambient pressure at altitude?

• A. Anemic hypoxia
• B. Hypobaric hypoxia
• C. Histotoxic hypoxia
• D. Ischemic hypoxia

Answer: (B)

At altitude, the surrounding air pressure drops, which lowers the partial pressure of inspired oxygen and, in turn, the amount of oxygen that gets into the arterial blood. This reduces arterial oxygen content and oxygen delivery to tissues. The term for this specific effect of reduced ambient pressure is hypobaric hypoxia. Other types of hypoxia reflect different problems: anemic hypoxia comes from insufficient hemoglobin or dysfunctional hemoglobin, histotoxic hypoxia from the body's cells being unable to use oxygen (toxins like cyanide), and ischemic hypoxia from reduced blood flow to tissues. Here, the scenario is about the ambient pressure limiting oxygen entry, so hypobaric hypoxia is the correct description.

At altitude, the surrounding air pressure drops, which lowers the partial pressure of inspired oxygen and, in turn, the amount of oxygen that gets into the arterial blood. This reduces arterial oxygen content and oxygen delivery to tissues. The term for this specific effect of reduced ambient pressure is hypobaric hypoxia.

Other types of hypoxia reflect different problems: anemic hypoxia comes from insufficient hemoglobin or dysfunctional hemoglobin, histotoxic hypoxia from the body's cells being unable to use oxygen (toxins like cyanide), and ischemic hypoxia from reduced blood flow to tissues. Here, the scenario is about the ambient pressure limiting oxygen entry, so hypobaric hypoxia is the correct description.