9. How are arteries different from veins? A. Arteries pump blood away from the heart; veins deliver and absorb oxygen, nutrients, and other substances. B. Arteries transport blood away from the heart; veins return blood back toward the heart. C. Arteries produce blood; veins collect oxygen from the blood. D. Arteries carry deoxygenated blood, veins carry oxygenated blood. 10. After exercise, you have likely noticed that your heart beats more quickly than normal. Why is it happen? A. Your muscles need extra oxygen thus heart starts to pump harder and faster to circulate blood to deliver oxygen to your muscles. B. Deoxygenated blood filled the heart thus makes the heart rate faster. C. Your lungs received more carbon dioxide after exercise. D. Pulmonary circulation happens during physical activity thus makes your heart rate faster.
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Arteries transport blood away from the heart. Veins return blood back toward the heart. Capillaries surround body cells and tissues to deliver and absorb oxygen, nutrients, and other substances.
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