Muscle Contraction Electrical

brawninessman Contraction ElectricalExperiment 5 Muscle Structure and FunctionIntroduction Muscles are found almost any parts of our body. They can be classified in to 2 types (smooth pass and striated muscle) ground on their morphology and functions. The function unit of muscle cells is called sarcomere. The mechanism of all muscles contraction is generally the same that is based on the sliding-filament theory involving the interaction of the contracted proteins actin and myosin.Muscles are very important in locomotion, eating process, sound production and etc. 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 nerve of the frog was electrically stimulated to mimic the physiological trains of action potentials traveling down the nerve and its innervated muscle. When sciatic nerve was stimulated electrically, it depolarized and generates an action potential which passing along the nerve to gastrocnemius muscle by dint of neuromuscular junction. Gastrocnemius muscle depolarized by the incoming 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, temporal summation, tetanus and fatigue of muscle were examined. affair Please refer to the lab manual P.54- P.62, exceptIn part C, students are not required to do single twitch.2. P.62 Part D metre 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 Ringer water regularly to keep them alive.Leave enough muscle for femur clamp to hold the sample.Dont damage the nerve.ResultPart A atomic number 53 muscle twitch