Which type of hypoxia occurs when circulation is inadequate despite adequate oxygen carrying capacity?

Which type of hypoxia occurs when circulation is inadequate despite adequate oxygen carrying capacity?

• A. Hypoxic Hypoxia
• B. Hypemic Hypoxia
• C. Stagnant Hypoxia
• D. Histotoxic Hypoxia

Answer: (C)

Oxygen delivery to tissues depends on both how much oxygen is carried in the blood and how well that blood is circulating. When the oxygen content is adequate but the circulation is reduced or pooling occurs, tissues don’t receive enough oxygen. This is stagnant (circulatory) hypoxia. It happens, for example, with heart failure or shock, where blood flow is insufficient even though hemoglobin is carrying oxygen normally. Other types involve problems with oxygen content or cellular use: hypoxic hypoxia is too little oxygen in the blood, hypemic hypoxia is insufficient carrying capacity (like anemia or CO poisoning), and histotoxic hypoxia is the body's cells being unable to use oxygen (as in cyanide poisoning). The scenario described—circulation is inadequate despite adequate oxygen carrying capacity—best fits stagnant hypoxia.

Oxygen delivery to tissues depends on both how much oxygen is carried in the blood and how well that blood is circulating. When the oxygen content is adequate but the circulation is reduced or pooling occurs, tissues don’t receive enough oxygen. This is stagnant (circulatory) hypoxia. It happens, for example, with heart failure or shock, where blood flow is insufficient even though hemoglobin is carrying oxygen normally. Other types involve problems with oxygen content or cellular use: hypoxic hypoxia is too little oxygen in the blood, hypemic hypoxia is insufficient carrying capacity (like anemia or CO poisoning), and histotoxic hypoxia is the body's cells being unable to use oxygen (as in cyanide poisoning). The scenario described—circulation is inadequate despite adequate oxygen carrying capacity—best fits stagnant hypoxia.