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Images, Videos & Interactives
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. The Human Body X-ray image of coronary artery circulation 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. 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.
What does an electrocardiogram show?
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Male muscle, man flexing arm, bicep curl.
Facts You Should Know: The Human Body Quiz
3d illustration human heart. Adult Anatomy Aorta Black Blood Vessel Cardiovascular System Coronary Artery Coronary Sinus Front View Glowing Human Artery Human Heart Human Internal Organ Medical X-ray Myocardium
Human Organs
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Videos

What does an electrocardiogram show?
This video shows how quickly an electrical impulse is conducted from the sinoatrial...
Video: Encyclopædia Britannica, Inc.

Images

Human heart
The human heart is both a pump and a muscle. Its four chambers move blood efficiently,...
Encyclopædia Britannica, Inc.
X-ray image of coronary artery circulation
Figure 13: A synchrotron X-ray image of the coronary artery circulation of a human...
Edward Rubenstein, Stanford University School of Medicine
The human heart
The four chambers of the human heart shown in cross section.
Encyclopædia Britannica, Inc.
Human circulatory system
Parts of the human circulatory system that highlight arterial supply and venous drainage...
Encyclopædia Britannica, Inc.

Interactives

The Human Body
Experience the major systems of the human body.
Encyclopædia Britannica, Inc.
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