What are the vessels called that connect the arterioles with the venules?
Arteries carrying oxygenated blood away from the heart transfer blood to veins once the oxygen is used up. Veins then carry it back to the heart and lungs to be pumped round again with fresh oxygen.
When arteries connect to veins, they split up into arterioles and venules, literally meaning 'little arteries' or 'little veins'. Arterioles and venules then connect through a network of capillaries, the smallest unit of a blood vessel, coming from the Latin capillus, hair.