hence when iodine water it turns blue-black 6. Which one of the following statements is correct about the human circulatory system? (a) Blood transports only oxygen and not carbon dioxide. (b) Human heart has five chambers. (c) Valves ensure that the blood does not flow backwards. (d) Both oxygen-rich and oxygen-deficient blood gets mixed in the heart. [CBSE 2020]
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Blood transports only oxygen and not carbon dioxide.
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a) Blood transports only oxygen and not carbon dioxide.
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