ACP Quiz - Definition and Causes Question Title * 1. The heart has two upper chambers called _____________ and two lower chambers called _____________ Atria, valves Atria, ventricles Valves, ventricles Septa, ventricles Question Title * 2. Coronary artery disease is the most common cause of heart failure. True False Question Title * 3. Heart failure always has a known cause. True False Done