A SINGLE MUSCLETWITCH ANDTETANIC CONTRACTIONLi JingxinPhysiologcal Department
A SINGLE MUSCLE TWITCH AND TETANIC CONTRACTION Li Jingxin Physiologcal Department
A SINGLE MUSCLE TWITCH When a muscle is stimulated, it contractsafter a latent period and this is immediatelyfollowed by relaxation, this is called singlemuscle twitchStart stimulating1.latent period2.contraction period3.relaxation period
A SINGLE MUSCLE TWITCH • When a muscle is stimulated, it contracts after a latent period and this is immediately followed by relaxation, this is called single muscle twitch. 1.latent period 2.contraction period 3.relaxation period Start stimulating
TETANIC CONTRACTION When a muscle is stimulated at very highfrequency(100/s), the successivecontractions completely fuse together andcannot be distinguished one from the otherThis state of sustained contraction is calledTetanization
TETANIC CONTRACTION • When a muscle is stimulated at very high frequency(100/s), the successive contractions completely fuse together and cannot be distinguished one from the other. This state of sustained contraction is called Tetanization
Prepare a nerve and musclepreparationSciatic nerve-gastrocnemius of frog
Prepare a nerve and muscle preparation Sciatic nerve-gastrocnemius of frog
femurbicepsfemoris股骨temo股二头肌股三头肌半膜肌股二头肌semimembranous半膜肌musclebicepsfemorisSemimembranousmuscle
biceps femoris Semimembranous muscle Quadriceps femoris semimembranous muscle biceps femoris femur