ES 2002 Lecture Notes - Lecture 4: Myofibril, Sarcomere, Epimysium

• School: App State
• Department: Exercise Science
• Course: ES 2002
• Professor: Marco Meucci

Document Summary

Muscles are made up of fascicles that are bound together by epimysium. The fascicles are made up of muscle fibers that are bound together by perimysium. The muscle fibers are considered the cell of muscle tissues and they are made up of myofibril that are bound together by endomysium. Myofibril are made up of sarcomere, which are the smallest contractile unit. Actin is the thin filament and myosin is the thin filament. The actin acts as an anchor for the sliding myosin. During muscle contraction, actin and myosin slide against each other. The synapse is the junction where a motor neuron meets the muscle fiber. This initiates the generation of the action potential, which depolarizes the muscle membrane. Creatine phosphate metabolism produces energy very quickly, but lasts a very short time (15 seconds) Anaerobic glycolysis, also known as oxidative phosphorylation, produces energy quickly but without oxygen and lasts 30 40 seconds.