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What carries oxygen-depleted blood to the heart?
Arteries
Veins
Erythrocytes
Deltoid
The correct answer is: Veins
Veins carry oxygen-depleted blood back to the heart. Arteries carry oxygen-rich blood away from the heart. Erythrocytes, also known as red blood cells, are responsible for carrying oxygen to the body's tissues and organs. The deltoid is a muscle in the shoulder and is not directly involved in transporting blood to the heart. Therefore, the correct answer is B.