Pulmonary Arteries: The Only Vessels Leaving an Atrium
The pulmonary arteries are the only blood vessels that carry blood away from an atrium—specifically, the right atrium (via the right ventricle). They transport deoxygenated blood to the lungs for oxygenation.
All other arteries arise from ventricles: the aorta from the left ventricle, and the pulmonary trunk from the right ventricle (which then splits into left/right pulmonary arteries). The pulmonary veins return oxygenated blood to the left atrium.
This unique arrangement defines the pulmonary circulation: right atrium → right ventricle → pulmonary arteries → lungs → pulmonary veins → left atrium.
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