Heart atrium — Free Physiology Illustration | GPAI | GPAI

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Heart atrium — Free Physiology Illustration | GPAI | GPAI

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Heart atrium

Heart atrium

Physiology

Heart atrium

A simplified single atrium of the human heart shown as a small upper cardiac chamber with a thin reddish-pink muscular wall, a rounded pouch-like or sac-like main body, and a smooth hollow interior. The chamber is smaller and less muscular than a ventricle, with soft curved contours and an opening leading downward toward the ventricle. A short vessel opening for blood entry may be present at the top or side, and the atrium may include a small wrinkled auricle-like ear-shaped appendage extending from one side.

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