are capillaries all throughout the body
The blood vessels-arteries, capillaries, and veins-are an extensive network of elastic tubes that carry blood to and from the heart and throughout the body. The blood vessels are the transportation system of the human body.he blood vessels-arteries, capillaries, and veins-are an extensive network of elastic tubes that carry blood to and from the heart and throughout the body. The blood vessels are the transportation system of the human body.