1) Contains blood under the highest pressure. a) veins b) arteries c) capillaries 2) Contains valves a) veins b) arteries c) capillaries 3) Has the thickest walls. a) veins b) arteries c) capillaries 4) Its walls are only 1 cell thick. a) veins b) arteries c) capillaries 5) Forming networks at tissues and organs a) veins b) arteries c) capillaries 6) Carries blood way from the heart a) veins b) arteries c) capillaries 7) Carries blood towards the heart a) veins b) arteries c) capillaries 8) Have the widest central channel. a) veins b) arteries c) capillaries 9) Allow efficient exchange of materials. a) veins b) arteries c) capillaries

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