KNES 200 Study Guide - Final Guide: Skeletal Muscle, Cardiac Muscle, Myocyte
13 Aug 2016
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Agonist (prime mover: muscle or group of muscles producing a desired effect. Antagonist: muscle or group of muscles opposing the action. Synergist: muscles surrounding the joint being moved. Fixators: muscle or group of muscles that steady joints closer to the body aix so the desired action can occur. Organized in series (attached end to end) Two types of protein myofilaments: actin: thin filament, myosin: thick filament. Each myosin is surrounded by six actin filaments. Projecting from each myosin are tiny contractile myosin bridges. Cross bridge formation: a signal comes from the motor nerve activating the fiber, heads of the myosin filaments temporarily attach themselves to the actin filaments. Cross bridge movement: similar to the stroking of the oars and movement of rowing shell, movement of myosin filaments in relation to actin filaments, shortening of the sarcomere, shortening of each sarcomere is additive. Slow twitch fibers: slow oxidative (types i, in the aerobic system.
