What is capillary?
SUBSCRIBE Healthline uses cookies to improve your experience and to show you personalized ads. Privacy Policy. ACCEPTMore information Capillaries and Their Functions  Medically reviewed by Stacy Sampson, D.O. — Written by Jill Seladi-Schulman, Ph.D. on March 12, 2019 Functions Types Dysfunction Takeaway 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 certain elements between your blood and tissues.
