Arteries- carry blood away from heart towards organs. Thick elastic walls to cope with the high blood pressure coming from heart/ nothing can pass through the artery walls.
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Veins- carry blood from organs back to the heart, thin, less elastic walls and have valves to prevent backflow of blood. nothing can pass through the vein walls
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capillaries connect arteries to veins. They have narrow, thin wall (only one cell thick) exchange of substances between cells and blood happens here
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Energy loss and energy gain from your body need to be balanced so that body temp stays constant.
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Veins- carry blood from organs back to the heart, thin, less elastic walls and have valves to prevent backflow of blood. nothing can pass through the vein walls
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