Answer:
1. The organ that pumps blood in your body is the heart.
2. Blood is carried away from the heart by arteries.
3. Blood is carried back to the heart by veins.
4. The smallest blood vessels are called capillaries.
5. The part of the heart where blood is received is the atrium.
6. The part of the heart that pumps blood out is the ventricle.
7. Oxygen is carried in your red blood cells by hemoglobin.
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