The document describes the structure and function of the human heart. It outlines the four chambers of the heart - right atrium, left atrium, right ventricle, and left ventricle. It notes the interatrial and interventricular septums that separate the chambers. Four valves are described - tricuspid, mitral, pulmonary, and aortic valves. The document explains that during diastole the heart fills with blood while during systole the ventricles contract to pump blood out of the heart.

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pericardium

5. pericardium

7. Right atrium •
Left atrium •
Right ventricle •
Left ventricle •
Interatrial septum •
Interventricular septum •

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Tricuspid valve -
Mitral valve -
Pulmonary valve -
Aortic valve -4

20. Diastole (Systole
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