Pulmonary Arteries: Oxygen Levels in Blood Flow
The pulmonary arteries carry deoxygenated blood from the right ventricle to the lungs for oxygenation.
- Only arteries in the adult body carrying deoxygenated blood.
- Oxygen saturation: ~70–75% (mixed venous blood).
- After gas exchange in pulmonary capillaries, blood becomes oxygenated (~95–100% saturation) and returns via pulmonary veins to the left atrium.
This is the pulmonary circulation (right heart → lungs → left heart), distinct from systemic circulation (left heart → body → right heart).
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