Watch Khan Academy series on circulatory and blood vessels for a review.
Blood vessels: layers & pre-capillary sphincters:https://www.khanacademy.org/science/health-and-medicine/circulatory-system/blood-vessels/v/layers-of-a-blood-vessel
Circulatory: https://www.khanacademy.org/science/health-and-medicine/circulatory-system
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