M Cardiac Chambers Valves and Circulation

Circulation through the heart is shown in the diagram below, which identifies the cardiac chambers, valves, and direction of blood flow. Because of their positions, the tricuspid and mitral valves are often called atrioventricular valves. The aortic and pulmonic valves are called semilunar valves because each of their leaflets is shaped like a half moon. Although this diagram shows all valves in an open position, they are not all open simultaneously in the living heart.

Superior vena cava

Aorta

Pulmonary artery (to lungs)

Pulmonic valve

Tricuspid valve

Inferior vena cava

Aorta

Pulmonary artery (to lungs)

Superior vena cava

Pulmonic valve

Tricuspid valve

Inferior vena cava

Superior Vena Cava Heart Diagram

Pulmonary veins (from lungs)

Mitral valve Aortic valve

LA = Left atrium LV = Left ventricle

RA = Right atrium RV = Right ventricle

Course of unoxygenated blood

Course of oxygenated blood

RA = Right atrium RV = Right ventricle

Course of unoxygenated blood

Course of oxygenated blood

Pulmonary veins (from lungs)

Mitral valve Aortic valve

LA = Left atrium LV = Left ventricle

As the heart valves close, the heart sounds arise from vibrations emanating from the leaflets, the adjacent cardiac structures, and the flow of blood. It is essential to understand the positions and movements of the valves in relation to events in the cardiac cycle.

Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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Responses

  • carrie
    What part of the heart is between the superior vena cava and the inferior vena cava?
    7 years ago
  • lauren
    Which artery is below the inferior vena cava?
    7 years ago

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