Blood vessels are the network of tubes within the body that transport blood. They are part of the circulatory system and play a crucial role in delivering oxygen, nutrients, hormones, and other important substances to cells and tissues while also removing waste products. There are three main types of blood vessels: 1. **Arteries**: These vessels carry oxygen-rich blood away from the heart to the body's tissues.
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A blood vessel is a tubular structure conducting blood within the circulatory system. Its endothelium and supporting wall differ among arteries, capillaries and veins. Conduction, exchange and volume storage are therefore emphasized differently in different vessel classes.