Follow the Blood · Heart
Four veins delivering oxygen-rich blood to the left heart.
Freshly oxygenated blood flows from your lungs back to your heart through the pulmonary veins — the mirror-image exception: veins carrying oxygen-rich blood.
There's more: four veins delivering oxygen-rich blood to the left heart. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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