The veins are neither strong nor thick of the blood vessels. On the contrary the veins are thin and thin walled. The arteries are strong and thick. They have to bear the pressure of the blood that comes from the heart.
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Blood vessels transport blood throughout the body. There are different types of blood vessels - the main ones being arteries, veins and capillaries. Arteries carry blood away from the heart, veins carry blood towards the heart and capillaries are where gas exchange occurs.
arteries, veins, and capillaries. Arteries carry oxygenated blood away from the heart, veins return deoxygenated blood back to the heart, and capillaries are tiny blood vessels that connect arteries and veins.
The four major parts of the circulatory system are the heart, blood vessels (arteries, veins, and capillaries), blood, and lymphatic system. The heart pumps blood throughout the body, the blood vessels transport blood to and from the heart, the blood carries essential nutrients and gases, and the lymphatic system helps maintain fluid balance and immunity.
larger blood vessels called veins which carry the blood back to the heart
If you mean not specifically, they are the veins.