The heart

• The heart has 4 chambers:
– 2 for pulmonary circuit:
• right atrium and right ventricle
– 2 for systemic circuit:
• left atrium and left ventricle
• Left ventricle has a greater workload
• Is much more massive than right ventricle, but the two chambers pump equal amounts of blood
• AV valves prevent backflow from ventricles into atria
• Semilunar valves prevent backflow from aortic and pulmonary trunks into ventricles

• Anatomy of the Heart
• Relation to Thoracic Cavity
• 3 Layers of the Heart Wall
• Structure of the heart
• Heart Rate