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# What are the components of the transport system in human beings? What are the functions of these components?

(i) Function of heart :The heart pumps oxygenated blood to all cells of the body.Also, during cellular respiration,the blood gets deoxygenated due to the release of $$CO_2$$ from cells so, the heart receives deoxygenated blood from the body parts and sends the deoxygenated blood to lungs for purification/oxygenation.