Coronary arteries arise from the roots of systemic arteries. O2-rich blood passes through the coronary arteries to the heart wall. The CO2-rich blood then returns to the heart through the coronary veins from the heart wall.
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Coronary arteries arise from the roots of systemic arteries. O2-rich blood passes through the coronary arteries to the heart wall. The CO2-rich blood then returns to the heart through the coronary veins from the heart wall.