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superior vena cava
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Illustration of a human heart in cross section, showing labeled chambers, valves, and major blood vessels including the aorta, pulmonary trunk, vena cavae, atria, and ventricles. Silhouette diagram of the human body highlighting the heart and major blood vessels, with labeled arteries in red and veins in blue to show the structure of the cardiovascular system. Diagram of the human circulatory system showing major arteries in red and veins in blue, with labeled pathways for arterial supply and venous drainage to organs including the heart, lungs, liver, kidneys, intestines, and lower limbs. Illustration of a human heart cross-section showing four chambers-left and right atria and ventricles-with labeled major blood vessels. An inset highlights cardiac muscle tissue, showing myocytes and intercalated disks.
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The human heart
The four chambers of the human heart shown in cross section.
Encyclopædia Britannica, Inc.
human circulatory system
Human circulatory system.
Encyclopædia Britannica, Inc.
Human circulatory system
Parts of the human circulatory system that highlight arterial supply and venous drainage...
Encyclopædia Britannica, Inc.
Human heart
The human heart is both a pump and a muscle. Its four chambers move blood efficiently,...
Encyclopædia Britannica, Inc.