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                                    Jo.A motor unit consists of: | 
                            
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Answer»  Motor unitsare the final element of neuromotor control. In manner analogous to the organization of neuromotor control in other skeletal muscles, diaphragmmotor unitscomprise phrenic motoneurons located in the cervical spinal cord that innervate the diaphragm muscle, the main inspiratory muscle in mammals. Diaphragmmotor unitsplay a primary role in sustaining ventilation but are also active in other nonventilatory behaviors, including coughing, sneezing, vomiting, defecation, and parturition.  | 
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