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                                                                                            4.      Impulses from the cerebral cortex



                  FACTORS                                                                   • The motor areas of the cerebral cortex,





                  AFFECTING                                                                     simultaneously stimulate the medullary

                                                                                                respiratory neurons and activate the motor

                                                                                                neurons of the exercising muscles.
                  RESPIRATION                                                               • Voluntarily person can hold the breath or




                                                                                                hyperventilate temporarily , can be override


                                                                                                by changes in arterial blood gases.
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