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        Blood Vessels, Part 1: Form and Function | Crash Course A&P 27

        We begin our look at how blood gets around your body. In this episode, we look at the basic three-layer structure of your blood vessels. We review how those structures differ slightly in different types of vessels. We will also follow the flow of blood from your heart to capillaries in your right thumb, and all the way back to your heart again.

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