Muscle Contraction Electrical

Muscle abridgment ElectricalExperiment 5 Muscle Structure and Function cornerstone Muscles are found almost any parts of our body. They can be classified in to 2 types (smooth ponderousness and striated muscle) based on their sound structure and functions. The function unit of muscle cells is called sarcomere. The mechanism of all muscles contraction is broadly speaking the same that is based on the sliding-filament theory involving the interaction of the contractile proteins actin and myosin.Muscles are very important in locomotion, eating process, sound p roduction and etcetera different types and patterns of electrical signals will result in different muscle contraction.The aim of this experiment is to study the muscle contractions when applying electrical signal to a nervous system. The sciatic heart and soul of the frog was electrically fixd to mimicker the physiological trains of action potentials traveling down the nerve and its innervated muscle. When sciatic nerve w as stimulated electrically, it depolarized and generates an action potential which passing along the nerve to gastrocnemius muscle muscle through neuromuscular junction. Gastrocnemius muscle depolarized by the accounting entry electrical signal and contracted in respond. As a result, the gastrocnemius muscle that located on the upper legs of frog will contract. By adjusting the intensity and frequency of stimulation, the contraction pattern of a single twitch, blase summation, tetanus and fatigue of muscle were examined.Procedure Please refer to the laboratory manual P.54- P.62, exceptIn part C, students are not demand to do single twitch.2. P.62 Part D Step 8 = stimulate the muscle with electrode (not the clamp)Precaution1. Dont touch the nerve with metal (use the glass rod instead), otherwise, no electrical currentRinse nerve and muscle with knockoff water regularly to keep them alive.Leave enough muscle for femur clamp to hold the sample.Dont damage the nerve.ResultPart A exclusive muscle twitch