OverviewThe valves of the heart open and close to control the flow of blood entering or leaving the heart.
Update Date 6/2/2014
Updated by: Norman S. Kato, MD, Surgeon with the Cardiac Care Medical Group, Encino, CA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.