Researchers say they have found four new types of human blood cell in a study that could rewrite biology textbooks. The newly found cells play a role in the body's immune system and help our bodies to ...

White blood cells are the cells that help the body fight infection There are a number of different types and sub-types of white blood cells which each have different roles to play. Granulocytes are ...

The blood flows around the body in blood vessels (tubes) called arteries, veins and capillaries. This is the circulatory system. The heart pumps the blood through the circulatory system. Arteries ...

Only one in every six million people have the Rh null blood type. Now researchers are trying to grow it in the laboratory in the hope it could save lives. Blood transfusions have transformed modern ...

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In 2011, a woman from the French overseas region of Guadeloupe underwent routine tests before a surgery. Strikingly, doctors could not identify her blood group, which was so unique that they did not ...

More than a century after their discovery, we still don’t know what blood groups like O, A and B are for. Do they really matter? Carl Zimmer investigates. When my parents informed me that my blood ...

Flow chart: Karl Landsteiner discovered blood types in 1900, yet scientists have still not come up with an explanation for their existence (SCIEPRO/Getty) When my parents informed me that my blood ...