1. Cardiac Cycle: Path of blood through the heart
• The right atrium receives deoxygenated blood from the body through the vena
cava
• The left atrium receives oxygenated blood from the pulmonary vein
• Blood passes through valves from the atria to the ventricles
• Valves prevent the backflow of blood into the atria

2. • The right ventricle pumps deoxygenated blood to the lungs through the
pulmonary artery
• The left ventricle pumps oxygenated blood to the rest of the body through the
aorta
• Valves prevent back flow into the ventricles