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Week2_Finger_Twitch_joshdean_section_30_Group_4_Week2 (1)

Week2_Finger_Twitch_joshdean_section_30_Group_4_Week2 (1) -...

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ECE 3280 Principles and Practice of Biomedical Engineering Laboratory Finger Twitch Experiment Section 30, Group 4 Felipe Zambrano (33%) Joshua Dean (33%) and Keith Oldano (33%) Experiment Conducted September 9, 2011 Submitted September 16, 2011 Abstract Electrical stimulation of muscle cells located around the mid-forearm enables the finger “twitch” reflex to manifest in an attempt to understand the connections of finger contractions. The amount of voltage and frequency of the electrical stimulation, respectively affect the magnitude of finger displacement from the twitch and the number of twitches occurring until tetanus. Although each individual person has their own unique results for voltage threshold, maximum finger displacement, and frequency fatigue, group 5 tested to see if what the overall average would be and if there was a significant difference between results based on sex. In order to obtain an average for the lab and result differences based on sex, we proceeded with the electrical stimulation on each group member; collected the results for the tested variables, and performed a Null-Hypothesis and T-Test for data analysis. The analysis indicated the entire lab having an average voltage threshold of 27.8846mV, Finger displacement of 12.9400cm, and a frequency fatigue of 94.3077Hz. However, there was not enough evidence to indicate significant differences between male and female results using a 0.05 as alpha in the null hypothesis. Our results provide a starting point for those testing the experiment to use as guidelines and perhaps test for other differences other than participant’s sex. Introduction
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The experiment is heavily focused on the communication involving the nervous and muscular systems in order to produce the finger twitch. The process begins with a stimulus that has been already registered to the brain and the message to produce the reflex is being sent back down the neural network to the neurons in charge controlling the skeletal muscle fibers, known as motor neuron. The motor neurons stimulate an electrical impulse, or action potential, in the sarcolemma where the action potential arrives at the synaptic terminal. Once there, acetylcholine is released and bound to the motor end plate to cause a change in the membrane permeability to sodium ions. Sodium ions rush into the sarcoplasm to produce another action potential, but within the sarcolemma, which will spread over its entire surface down to the transverse tubules toward the terminal cisternae encircling the muscle fiber’s sarcomeres to trigger the muscle fibers’ contraction. Finally, acetylcholinesterase breaks down acetylcholine in order for another action potential to occur. Similarly, the experiment will be simulating electrical impulse that will act like the action potential to trigger the same reflexive twitch.
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