Multiple choice

Impure blood is carried to the heart by :

  1. arteries

  2. nerves

  3. veins

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Veins carry deoxygenated blood from body tissues back to the heart's right atrium, while arteries carry oxygenated blood away from the heart. The veins have valves to prevent backflow since the blood pressure is lower in the venous system. This distinction is fundamental to understanding circulatory system function.

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