Chambers and the valves of the heart

DS00727, DS00412, DS00616, DS00421, DS00434, DS00628, AN00360, DS00832,DS00744,DS00061_IM02309-mcdc7_theheartthu.jpg A normal heart has two upper and two lower chambers. The upper chambers, the right and left atria, receive incoming blood. The lower chambers, the more muscular right and left ventricles, pump blood out of your heart. The heart valves, which keep blood flowing in the right direction, are gates at the chamber openings.