The importance of circulation and the structure of the heart

In this topic

• Why circulation matters
• The heart — a muscular pump
• Four chambers and the valves
• The cardiac cycle and automatism

Key terms

• Heart
• Pericardium
• Atrium
• Ventricle
• Septum
• Cuspid (atrioventricular) valve
• Semilunar valve
• Tendinous cords
• Aorta
• Pulmonary artery
• Cardiac cycle
• Automatism

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