The binding of an oxygen molecule to the heme group of any of the 4 chains which induces a conformation change, increasing the affinity for oxygen.
                                                            
                                                     
                        
                                                
                        
                        
                            the bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungs; "oxyhemoglobin transports oxygen to the cells of the body" 
                                                            
                                                     
                        
                                                
                        
                        
                            Hemoglobin charged with oxygen in the arterial blood.
                                                            
                                                     
                        
                                                
                        
                        
                            ox-ee-HEEM-o-GLO-bin Bright red hemoglobin that has just picked up oxygen in the lungs. 715
                                                            
                                                     
                        
                                                
                        
                        
                            The bright red hemoglobin that is loosely combined with oxygen and found in arterial blood.