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        K-6

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        Part of Science Trek
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        Blood | Science Trek

        This video segment from IdahoPTV's Science Trek defines the 4 parts of blood and shows the rest of the circulatory system. Discover where blood is made, how long a blood cell lives, what blood types are, why blood is red, and what a transfusion is.

        Visit the Science Trek companion web site to learn more about blood.

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