Individuals possessing which blood category can donate to anyone, earning them the title of universal donors?
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Answer: A. O-
Explanation
Individuals possessing O-negative blood can donate to anyone, earning them the title of universal donors. O-negative red blood cells lack A, B, and Rh surface antigens that trigger immune rejections. This absence of major antigens allows recipients of any blood type to receive O-negative blood safely. The ABO blood group system classifies blood based on inherited carbohydrate antigens on red cells. The Rh factor is an additional protein marker that determines whether blood is positive or negative. Universal donors are critically important during emergency transfusions when blood typing is unknown.
Hospital blood banks maintain high reserves of O-negative blood for trauma and emergency medical care. Donating blood is a voluntary medical procedure that saves countless lives in surgical settings worldwide. Immunology research ensures that transfusion compatibility standards remain rigorous to prevent fatal reactions. O-positive blood can be given to many people, but its Rh factor makes it unsuitable for Rh-negative recipients. AB-positive individuals are universal recipients rather than universal red blood cell donors. AB-negative blood features surface antigens that prevent it from being safely donated to all blood types.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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