What best describes anemia?

Anemia is best described as an inadequate number of red blood cells in the body. Red blood cells play a crucial role in transporting oxygen from the lungs to the rest of the body and returning carbon dioxide back to the lungs. When the body lacks sufficient red blood cells, it can lead to a variety of symptoms including fatigue, weakness, and pallor due to decreased oxygen supply to tissues.

While excessive weight loss, inability to feel sensation, and anger outbursts can be associated with various medical conditions or psychological issues, they do not accurately define anemia. The hallmark of anemia specifically revolves around the deficiency in red blood cells or hemoglobin, rather than these unrelated symptoms. Thus, understanding that anemia specifically pertains to the quantity and functionality of red blood cells clarifies why this option is the most accurate description.