However, that particular doctor, the family physician, represents only one of the countless areas in which medical professionals work. In fact, there is a specific type of doctor for almost every major system located in the human body. Listed below are just thirty of the dozens of examples:
A knockout (abbreviated to KO or K.O.) is a fight-ending, winning criterion in several full-contact combat sports, such as boxing, kickboxing, muay thai, mixed martial arts, karate, some forms of taekwondo and other sports involving striking.
If a match goes longer than 20 minutes without a knockout or other decision, then it is either a draw or a decision on points. In title fights, this is called  the championship distance , which today usually means 12 rounds (See history section), though there were some ten-round championship matches.n the early days of bare-knuckle boxing, there was no limit on the number of rounds and so matches would be fought to a conclusion (i.e. with a knockout or tap out). For example, the match between Simon Byrne and James 'Deaf' Burke in 1833 lasted 3Â¼ hours.