Summation and Tetanus

299 Words2 Pages
Abstract: The experiment was conducted by using frog’s legs to understand how the muscle response to different levels of stimulations, and the levels of the twitch is also related to the number of motor units recruited. We used the program LabScribe to collect the data from the graph, and we also used the stimulator to stimulate the muscle through computer. We found out when the response reached the threshold and plateau. For the second experiment, we increased the Frequency from 0.5 Hz to 1Hz and then 2 Hz, 4Hz, 8Hz, 16Hz, 32Hz, 64Hz, and we found out when the graph reach to the summation and tetanus. Third, we used the graph in tetanus to calculate the speed of contraction and relaxation. Fourth, we rotated the femur clamp to adjust the muscle length and looked at the changed in response in volts, and found out the optimal length. In result, we found out the threshold voltage is about 0.2 volts and the plateau is at 2.2 volts, the summation started at 16Hz, and it reached tetanus at 64Hz, for the optimal length, we did not get enough time to finish it, and it should be somewhere higher then 35 mm. Introduction: Introduction: Title: Muscle twitch response and recruitment, summation and tetanus Exercise 1: The effects of nerve stimulation Objectives: 1. To explore the motor and sensory effects of electrical stimuli on a student volunteer, using the nerves of the forearm. 2. To examine the position where a largest muscular twich response with the lowest pulse current can be generated. This position is kept constant to determine results in exercises 2 and 3. Procedure: Refer to Human Biology Practical Manual Results: The position giving the largest muscular twitch response with the lowest pulse current can be

More about Summation and Tetanus

Open Document