Cells

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A red blood cell is mostly made up of a protein called hemoglobin, which picks up oxygen at the lungs and delivers it to the rest of the body.
Red blood cells are important! They are all over your body and shaped like flattened basketballs.
Red blood cells also live for about 120 days in your body and are the most abundant cell in your blood!
Interesting! I know that some white blood cells alert the body it has been invaded, others produce chemicals to fight off invaders, and lastly some of them surround and kill organisms!
Did you know that white blood cells are just as important as red blood cells? Some people call white blood cells "disease fighters".
Cool!! I know that they are larger than red blood cells and that there aren't as many of them! They also have different "jobs" to do!
Plasma carries nutrients, hormones, which carry messages that tell the body what to do and when, and proteins throughout the body.
In your body, there is a yellowish liquid that is about 90% water. This is called plasma.
It also carries away cell waste.

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