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                  FACTORS                                                                   Protective reflexes





                  AFFECTING                                                                 e. During swallowing. The respiratory





                  RESPIRATION                                                                       center is reflexly inhibited to close
                                                                                                    airways to prevent food entering


                  OTHER THAN                                                                        the lungs.





                  NEED FOR GAS                                                              f.      Speaking, singing, and whistling:
                                                                                                    We also control our breathing to


                  EXCHANGE                                                                          perform such voluntary acts.
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