Five classes of blood vessels There are five classes of blood vessels: arteries and arterioles (the arterial system), veins and venules (the venous system), and capillaries (the smallest bloods ...

Broken blood vessels on the face, or spider veins, are enlarged capillaries that occur just beneath the surface of the skin. Genetics, sun exposure, sneezing, and many other factors can cause them.

Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them. They help to connect your arteries and veins in addition to facilitating the exchange of ...

‌Arteries and veins (also called blood vessels) are tubes of muscle that your blood flows through. Arteries carry blood away from the heart to the rest of the body. Veins push blood back to your heart ...