Compléter THE RESPIRATORY SYSTEMVersion en ligne NATURAL SCIENCE. BILINGUAL SCHOOL par Gonzalo Barral 1 oxygen carbon expelled cells lungs energy dioxide gas process circulatory tracts cells oxygen lungs performing Respiration is an essential for our bodies . Through this process we receive the that our need to obtain , and expel carbon . The respiratory system is responsible for this exchange . The respiratory system consists of the respiratory and the . It works closely with the system , which transports from the lungs to the cells and dioxide from the to the , so that it can be .
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