People have different blood types because of special markers on their red blood cells. These markers are like invisible stickers that tell the body, 'This is one of us!' or 'Watch out, this isn't one of us!' If someone has a marker your body doesn’t recognize, it might attack them! That's why some people can give blood to others, and some can't.
Examples
- A person with type AB can receive blood from anyone, making them the universal recipient.
- Type O is called the universal donor because it doesn’t have any antigens that other blood types might attack.
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See also
- How Do Birds Migrate So Far?
- What Causes Hiccups?
- How Can a Single Seed Grow into a Tree?
- Why Do People Have Different Shapes of Faces?
- Why Do We Blink?
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Categories: Biology · blood,genetics,immune system