MCB 244: Week 9 Lecture Summary notes
MCB 244: Week 9 Lecture Summary notes MCB 244
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This 2 page Class Notes was uploaded by Laura Kunigonis on Monday October 26, 2015. The Class Notes belongs to MCB 244 at University of Illinois at Urbana-Champaign taught by Dr, Chester Brown in Fall 2015. Since its upload, it has received 13 views. For similar materials see Human Anatomy and Physiology I in Biology at University of Illinois at Urbana-Champaign.
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Date Created: 10/26/15
Chapter 11 P l parallel muscles most common fascicle arrangement fibers parallel to the long axis parallel muscles muscle shortens about 30 and becomes larger in diameter bulges parallel muscles tension depends on total number of myofibrils ex biceps brachii parallel muscles tension directly relates to cross sectional area of muscle convergent muscles a broad area converges on attachment site ex tendon aponeurosis raphe raphe slender band of collagen fibers convergent muscles versatile muscle as fibers can pull in different directions gt stimulation of different motor units results in directionality convergent muscles when all fibers stimulated LESS tension is generated on attachment site as compared to parallel muscles because of the fiber arrangement pennate muscles form an angle with the tendon gt do not move as far as parallel muscles pennate muscles contain more myofibrils than parallel muscles gt develop more tension than parallel muscles of the same size unipennate muscles fibers on one side of tendon ex extensor digitorum bipennate muscles fibers on both sides of tendon common ex rectus femoris multipennate muscles tendon branches within muscle ex deltoid sphincters circular muscles ex orbicularis oris sphincters open and close to guard entrances of body digestive and urinary tracts lever a rigid structure that moves on a fulcrum a fixed point firstclass lever applied force and load are on opposite sides with fulcrum in between ex pry bar neck tension firstclass lever force and resistance are balanced gt seesaw or teetertotter
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