#Id: 4015
                                        
                                        
                                            
Between heartbeats, influx of positively charged sodium ions causes a slow rise in the resting membrane potential in the positive direction. 

                                                                                    
                                     
                                    
                                        #Unit 7. System Physiology – Animal
                                        #Blood pressure, neural and chemical regulation of Cardiovascular System
                                        #Part B Pointers