The blood vessels include three major divisions arteries deliver blood from heart to capillaries Capillaries the smallest blood vessels and closest to body cells, the interchanges between blood and tissues occur there Veins carry blood from body to the heartThe blood vessels include three major divisions: Arteries – deliver blood from heart to capillaries Capillaries – the smallest blood vessels and closest to body cells, the interchanges between blood and tissues occur there Veins – carry blood from body to the heart