<prompt> Following tetanizing stimulus was to a muscle, there is a constant contraction. This is due toRecruitment phenomenonAt high stimulus frequency all muscle fibers are contactingContraction of different muscle fibers at different placesAll of the above  <response>: Tetanization: as the frequency of the stimulus increases to a critical level the successive contractions become so rapid that whole muscle contraction becomes smooth and contineous This is called tetanization and frequency is tetanizing frequency Ref:Guyton and Hall textbook of medical physiology 12th edition,page number:97 