1) Blood vessels that take blood away from the heart are a) Veins b) capillaries c) Arteries 2) Blood vessels that have valves to prevent back flow a) Veins b) Arteries c) Capillaries 3) Tiny blood vessels that have single cell thick walls a) Arteries b) Veins c) Capillaries 4) Blood vessels that have thick muscular walls a) Veins b) Arteries c) Capillaries 5) Blood vessels that carry mostly oxygenated blood a) Veins b) Arteries c) Capillaries

Blood vessels Challenge

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