We just learned that there are three types of Blood Cell red blood cells, white blood cells and platelets.
Let's learn a little about White Blood Cells, also called WBCs, leukocytes or leucocytes.
These cells in the blood help fight against diseases or other bad things in the body.
This could be a type of virus or some kind of germs that got into the blood.
White blood cells are made in the bone marrow.
If there are a lot of white blood cells in the body, this can be a way for doctors to tell if someone is sick.
Looking at a liter of blood, if there are between 4,000 and 11,000 white blood cells then this is ok.
If there is a lot more or a lot less, then it is a sign the person is sick.
There are a lot of different types of white blood cells and they all have different jobs for fighting off anything that might be trying to hurt your body.
(from: wikipedia - white blood cell)
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