You and your partner are dispatched to a residence at 145 Landa Street for a man with trouble breathing. The patient's wife, who called 9-1-1, told the dispatcher that her husband is ""breathing funny"" and is not responding to her appropriately. The time is 1510 hours, the temperature outside is 39 ° F (4 ° C), and a fine mist is falling.
a. What is the function of the respiratory system?