Which type of hypoxia is characterized by a deficiency in oxygen due to low atmospheric pressure?

Hypoxic hypoxia is characterized by a deficiency of oxygen resulting from low atmospheric pressure, which often occurs at higher altitudes. At these elevations, the partial pressure of oxygen decreases, reducing the amount of oxygen available for respiration despite the oxygen concentration in the air remaining constant. This leads to inadequate oxygenation of the blood, impacting bodily functions and leading to symptoms associated with altitude sickness.

In contrast, hypemic hypoxia involves a reduction in the blood's ability to carry oxygen, often due to factors like anemia or carbon monoxide poisoning. Stagnant hypoxia occurs when blood flow is compromised, such as in cases of shock or heart failure, leading to reduced oxygen delivery to tissues. Histotoxic hypoxia arises when cells are unable to utilize oxygen effectively, commonly due to toxic substances affecting cellular metabolism. Therefore, hypoxic hypoxia specifically addresses the environmental conditions leading to low oxygen availability at higher altitudes.