A&P Crossword
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
 
 
Down: 1) The fuild filled sac that the heart is enclosed in.2) The middle portion of the heart, composed of mostly muscle tissue, and contains intercalated disks.4) The lower border of the heart Across: 3) Responsible for removing metabolic waste, transporting nutrients and oxygen through out the body.5) Between the 2nd-6th intercoastal space.6) The outer layer of the heart.
 

 

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