I don't know whether a serated edge tears more flesh than a straight edge or not. I am a medical/surgical RN so I can tell you this a clean smooth cut will bleed much longer than a jagged tear. The more tissue that is torn crushed or damaged in an area the more of a substance called Prothrombin is released into the blood stream. Prothrombin stimulates the body to activate the clotting facters of the body. Think about how long it takes even a tiny razor nick while shaving to finally stop bleeding.