There are 10,000-20,000 white blood cells in one drop of blood, and even more when a person is ill. They are made in bone marrow. Plasma is the liquid that makes up more than half of the blood in ...
In response, a white blood cell arrives at the scene. This cell encircles the pathogen with its membrane, forming a tight, constricting ring. With remarkable force, the white blood cell yanks the ...
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