BLOOD 'N STUFF

Plasma

The liquid part of blood that carries nutrients and hormones throughout the body. It is mostly water, around 95% and contains dissolved proteins (6–8%). Plasma also serves as the protein reserve of the human body.

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Platelets

These are cell fragments that assist in blood clotting. There are 300,000 platelets per microliter of blood.
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Red Blood Cells

They are technically called Erythrocytes; Red blood cells are the most numerous type of blood cell. There are 5 million RBC per microliter of blood. RBCs have no nucleus.
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White Blood Cells

WBC's are both a part of the circulatory system and the immune system. Technically called Leukocytes.
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