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Which term describes a condition of decreased oxygen in the blood?

  1. Ischemia

  2. Hypoxia

  3. Melena

  4. Necrosis

The correct answer is: Hypoxia

The term that describes a condition of decreased oxygen in the blood is hypoxia. Hypoxia occurs when there is insufficient oxygen available to meet the needs of the tissues in the body, which can result from a variety of factors including respiratory issues, high altitudes, or inadequate circulation. While ischemia refers to insufficient blood supply to an organ or tissue, which can lead to a lack of oxygen, it specifically highlights problems related to blood flow rather than oxygen levels in the blood itself. Melena is related to the presence of black, tarry stools caused by gastrointestinal bleeding, and necrosis is the term for tissue death due to lack of blood flow or infection. Understanding these terms is crucial in distinguishing between various medical conditions that may involve compromised oxygen levels or blood supply.