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cardiac muscle
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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. Illustration of a human heart with a magnified callout showing the elongated, striated structure of cardiac muscle cells. graph depicting the five phases of the action potential of the heart muscle
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Male muscle, man flexing arm, bicep curl.
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cardiac muscle: Media

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Human heart
The human heart is both a pump and a muscle. Its four chambers move blood efficiently,...
Encyclopædia Britannica, Inc.
striated muscle in the human heart
Striated muscle fibers in the wall of the heart.
Encyclopædia Britannica, Inc.
graph depicting the five phases of the action potential of the heart muscle
Figure 9: The time course of each of the phases of the ventricular action potential...
Encyclopædia Britannica, Inc.
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