BIO 357 Lecture Notes - Lecture 12: Filet Mignon, Myofibril, Myocyte
Document Summary
When a muscle is used, it shortens/contracts, exerting a force as they do, causing the limb or other body part to move. Muscles are unable to lengthen on their own and require another force to do so. Antagonistic muscle will shorten to extend another muscle. Not all muscles have an antagonistic muscle. These muscles only use gravity to extend themselves. These are made from myosin and actin. These are the basic functional unit of contraction. They are arranged in series on a myofibril and are in between z-lines. Myofibrils are bundled and the bundle is covered by perimysium. Bundles of fascicles are held together by epimysium. Muscle fascicle muscle fiber myofibril sarcomere. Connective tissue runs through the muscle and meets at the ends, making tendons. Connective tissue runs through the muscles, connecting it to bone. There is less connective tissue within it, making it melt in the mouth. It is located along the vertebral column at the psois major muscle.
