I googled . If you haven ' t already , please don ' t . <| sep |> I ' m so worried bells goin to get hurt . <| sep |> This is a game bro . Don ' t take it too srs . <| sep |> I never understood when people say it ' s myoglobin , not blood ! As if blood is totally unrelated . Blood cells express large amounts of hemoglobin , a tetrameric protein , with each subunit containing a hemeiron group that gives it a red color . Myoglobin is related to hemoglobin subunits and binds oxygen via the ironheme group in a similar manner . Myoglobin is found largely in muscle cells where it diffuses oxygen from blood to the cells . Regardless of how you feel about blood or meat , it ' s not like myoglobin is some random other red protein unrelated to blood .