Musculoskeletal Physiology

University:
Virginia Maryland College of Veterinary Medicine
Course:
VM 8164 | The Normal Animal
Academic year:

2023
Views:

489

Pages:

2
Author:

Sarah Landeck

Skeletal An individual a muscle cell is called a fiber fascicle is Muscle bundle of individual a components Synergists that work to move Agonist causes Tendons together action something muscle that agonist The cell when contracts use active membrane fiber is My oblasts Digges passive contr muscles of a sarcolemm have don't proteins contractile muscle relaxes use muscle motion when Antagonist between ends Belly muscles contracts that head stationary distal end Insertion B C fibers muscle origin A a it and attached to bone muscle is striated so they fuse and develop them has 2 sarcomere Each types of microfilaments myosin and actin surrounded by troponin It when Caat binds to troponin it changes its con formation and allows actin and myosin to bind ATP Action F'A binding to potential myosin allows it is made by cell is normally at rest negative to change relative release actin in ion charge to the enviro positive ment it becomes when charged Gating opening and closing of ion channel pore tresponse to an electrical or chemical signal During depolarization Nat makes cell positive during repolarization Kt makes cell negative It depolarizations Nat enters cell cell Kt leaves cell repolarization When Ach binds to its It cell returns Nat channels open receptor this happens at the same time as cast from the SR 7 the most contraction Magnitude both cause muscle important source of contraction I amount for II more Types myosin of motor on units recruited contraction initial intermittan stimulation of rate means contraction cat needed for depends frequency TI release the SR from comes of too of length twitches of muscle greater potential fibers contraction of muscle fibers A Slow oxidative type I B Fast oxidative C Fast type IA glycolytic type IX fatigue