ex 14. skeletal muscle most numerous voluntary striated gives you shape, allows for facial...
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EX 14
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Skeletal MuscleMost numerousVoluntaryStriatedGives you shape, allows for facial
expressions, movement, and manipulation
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Cells of the Skeletal Muscle Long cylindrical cells called fibers Multinucleated Composed of myofibrils
Myofilaments○ Made of actin and myosin alternating to
produce the banding pattern (I and A bands)
Sacrolema- “plasma membrane” Sacroplasm- “cytoplasm”
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
Skeletal Muscle Fibers
Figure 10–2a The Formation of a Multinucleate Skeletal Muscle Fiber.
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
Skeletal Muscle Fibers
Figure 10–2 The Formation of a Multinucleate Skeletal Muscle Fiber.
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SarcomeresContractile unitsMade up of bundles of myofibrilsExtend from middle of I band to middle of
next myofibril
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Organization of Skeletal Muscle Cells into Muscles Endomysium – areolar connective tissue
sheath that covers muscle fibers Perimysium – encloses sheathed
muscle Fascicle-bundle of perimysium Epimysium-bundle of fasciles Epimysium blend into deep fascia Fascia blends into tendons
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
Skeletal Muscle Structures
Figure 10–1 The Organization of Skeletal Muscles.
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Tendons provide durability and conserve spaceProvide route of entry for blood vessels
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Neuromuscular Junction
Junction between a nerve fiber and a muscle cell
Axons stimulate many muscle fibers Both neuron and muscle fibers make up
the motor unit Neurotransmitters cause a change in Na
and K concentration which causes muscle contraction
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