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           U-4 L-5

 WHAT IS THE WORK

    OF THE BLOOD?

In this two-page lesson, middle school students learn about the basic components of blood (plasma, and the three cells - red, white, and platelets). Clear illustrations help students understand the important concept of diffusion.

The opening story features Dr. Charles Drew, an African American physician who developed the method of drying and reconstituting blood plasma - a process that saved countless lives during World War II.

• U-4 L-5 / Human Blood: Welcome
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