PET 3322L Lecture Notes - Lecture 3: Pectoralis Major Muscle, Latissimus Dorsi Muscle, Semitendinosus Muscle
9 Dec 2017
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Comparison of muscle types: skeletal muscles, voluntary, striated, smooth muscle, not voluntary. Muscle structure: muscular fascia, connective tissue sheet on exterior of muscle, layers, epimysium, surrounds a whole muscle, perimysium, surrounds fasciculus (group of muscle fibers, endomysium. Sacromere shortening: when sarcomere shortens during muscle contraction the h band dissapeares, z bands are closer, i bands are smaller and the a bands don"t change. Isometric: no change in the length but tension increases, postural muscle of body, ex. ) Isotonic: change in lenth but tension constant, concentric, muscles shorten, bicep curl (think of muscle length and how bicep is shortening, eccentric, muscle lengthens, muscle tone, constant tension by muscles. Muscle fiber types: slow twitch, long distance runner, high fatigue resistance, fast twitch 2, sprinter, fast twitch 1 lower fatigue, sprinter. General principles of skeletal muscle anatomy: two points of attachment, origin or head, usually the most stationary, proximal end of the muscle.
