Diagram of the Action of the Heart
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Diagram to illustrate the action of the heart. Labels: aur, auricle (atrium); vent. ventricle; v, veins; a, aorta; m, mitral valve; s, semilunar valves. In A, auricle is seen contracting, ventricle dilated, mitral valve open, semilunar valves closed. In B, auricle is seen dilated, ventricle contracting, mitral valve closed, semilunar valves open.
Source
Kimber, Diana C. Anatomy and Physiology for Nurses (New York, NY: The Macmillan Company, 1907)
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