No oxygen to the brain is called what?

No oxygen to the brain is called what?

• A. Hypoxia
• B. Ischemia
• C. Anemia
• D. Anoxia

Answer: (D)

The key idea is understanding different levels of oxygen deprivation and how they affect the brain. No oxygen to the brain is called anoxia. Anoxia means complete absence of oxygen, which the brain cannot tolerate for long; neurons begin to die within minutes if oxygen isn’t restored. To contrast: hypoxia is reduced oxygen supply (not complete absence), ischemia is reduced blood flow to tissue (which can lead to hypoxia and tissue damage), and anemia is a lowering of red blood cells or hemoglobin that reduces the blood’s ability to carry oxygen to tissues. So, the term that specifically means there is no oxygen reaching the brain is anoxia.

The key idea is understanding different levels of oxygen deprivation and how they affect the brain. No oxygen to the brain is called anoxia. Anoxia means complete absence of oxygen, which the brain cannot tolerate for long; neurons begin to die within minutes if oxygen isn’t restored.

To contrast: hypoxia is reduced oxygen supply (not complete absence), ischemia is reduced blood flow to tissue (which can lead to hypoxia and tissue damage), and anemia is a lowering of red blood cells or hemoglobin that reduces the blood’s ability to carry oxygen to tissues. So, the term that specifically means there is no oxygen reaching the brain is anoxia.