NYPD cop who sifted through ten tons of 9/11 debris says he saw a ghost 'trying to help' while searching for clues to identify victims from attacks at landfill, book reveals. 1  Sgt. Frank Marra, 48, said he saw ghost of African American woman, who was dressed in white as a Red Cross worker from Second World War.
oxygen debt. a state that arises in very active muscles when insufficient oxygen is supplied by the lungs, causing the muscle tissue to respire anaerobically with the production of LACTIC ACID. When muscular activities slow down, the rate and depth of breathing remains at a high level until the lactic acid has been oxidized.
Each hemoglobin molecule binds four oxygen molecules so that each red blood cell carries one billion molecules of oxygen. There are approximately 25 trillion red blood cells in the five liters of blood in the human body, which could carry up to 25 sextillion (25 Ã 10) molecules of oxygen at any time.