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Valves
A structure in the heart and some veins that prevents the blood from flowing backwards.
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oxygen
A colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.
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Veins
any of the tubes forming part of the blood circulation system of thebody, carrying in most cases oxygen-depleted blood toward the heart.
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carbon dioxide
carbon dioxide is found in air, we get rid of it and we exhale carbon dioxide.
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ventricle
Each of the two main chambers of the heart, left and right. ( there are 4 chambers they are atrium, ventricle.)
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