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what is the primary function of the respiratory system your options are digestion circulation oxygenation or temperature regulation the correct answer is see that is oxygenation the main function of the respiratory system is to facilitate the exchange of oxygen and carbon dioxide crucial for cellular respiration question number two which structure prevents food and liquids from entering the trachea during swallowing your options are epiglottis Brony Alvi or diaphragm the correct answer is a that is epiglottis the epiglottis acts as a flap that covers the trachea during swallowing preventing the entry of substances into the airway question number three where does gas exchange primarily occur in the respiratory system your options are Brony Alvi trachea or bronchioles the correct answer is B that is Alvi gas exchange where oxygen is taken up and carbon dioxide is released occurs in the tiny air saxs called Alvi question number four what is the role of Celia in the respiratory system your