blood vessels part 1

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Structure of Blood Vessels Composed of three layers (tunics) Tunica intima – composed of simple squamous epithelium Tunica media – sheets of smooth muscle Contraction – vasoconstriction Relaxation – vasodilation Tunica externa – composed of connective tissue Lumen Central blood-filled space of a vessel

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Blood Vessels PART 1. Blood Vessels 3 major types of blood vessels: Arteries – carries blood away from the heart Capillaries – The functional vessels