Blood (B1)
Section outline
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Blood is an important fluid that keeps us alive. We cannot live without it. The heart pumps blood to all parts of the body and brings them oxygen and food. At the same time, blood carries all the substances we don't need away from us.
Blood fights infections, keeps our body temperature the same, and carries chemicals that control body functions. Finally, blood has substances that repair broken blood vessels so that we don't bleed to death.

Words
- blood vessel = one of the tubes through which blood flows in your body
- fluid = liquid, watery substance
- oxygen = a gas that is in the air and which we need to breathe
- repair = fix
- substances = material
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