GROWTH DEV FARM ANIM
GROWTH DEV FARM ANIM ANS 3043
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This 2 page Class Notes was uploaded by Laury Kreiger on Friday September 18, 2015. The Class Notes belongs to ANS 3043 at University of Florida taught by Staff in Fall. Since its upload, it has received 12 views. For similar materials see /class/206674/ans-3043-university-of-florida in Animal Science at University of Florida.
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Date Created: 09/18/15
Notes 18 Muscle Anatomy 1 Functions of muscle L V a Movement 1 Locomotion digestion breathing vision circulation 9 Do to unique ability of muscles to contract and shorten 9 Conversion of chemical energy to mechanical energy 0 20 to 25 ef cient remainder of energy lost as heat Communication 1 Direct voice related structures 2 Indirect by body movements Maintain body temp in warm blooded animals Food source for other animals and humans 1 High in protein minerals and vitamins Types of muscle based on microstrucutre amp manner of contraction a Smooth blood vessels GI tract repro tissues b Cardiac heart c Skeletal muscles Anatomy of skeletal muscle a General characteristics 1 Multinucleated with voluntary neural input 2 Striated 7 consist of sliding laments that contract and apply force to muscle 3 Large cells harnessed in a network of connective tissue Fig 222 O Acts as a harness to transmit contractile force to bone or other tissues Macrostructure l Epimysium connective tissue that surrounds entire muscle 9 Separates individual muscles into distinct units 9 Avenue for blood vessels and nerves to enter muscle 2 Perimysium connective tissue that surrounds muscle bundles fasiculi 9 Muscle bundle contains 20 to 40 muscle bers 9 Enmeshes and supports major blood vessels 9 Intramuscular fat marbling deposited within perimysium 3 Endomysium connective tissue that surrounds individual muscle bers 9 Lies immediately adjacent to muscle cell membrane 9 Major connective tissue responsible for meat tenderness increases with age Microstructure 1 Muscle ber or myo ber 7 structural unit of muscle Fig 223 7 224 9 Long cylindrical and multinucleated 9 May extend total length of muscle but normally extends partial length of muscle 0 Fibers terminating within muscle 7 intrafasicularly terminating bers 0 Growth in ber length increase number of bers and girth of muscle 9 Encased by the sarcolemma basement membrane 2 Myo brils Fig 226 229 9 Functional contractile unit of muscle composed of micro laments o Extends entire length of muscle cell 0 Bathed in cytoplasm which is high in protein 9 Sarcomeres muscle unit 38 n v
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