17 Skeletal Muscle Psysiology

17 Skeletal Muscle Psysiology - Muscular System Histology...

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9-1 Muscular System: Histology and Physiology
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9-2 Skeletal Muscle System Functions Body movement Maintenance of posture Respiration Production of body heat Communication
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9-3 Properties of Muscle Contractility : ability of a muscle to shorten forcefully Excitability : capacity of muscle to respond to a stimulus Extensibility : muscle can be stretched beyond and still be able to contract Elasticity : ability of muscle to recoil to original resting length after its been stretched
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9-4 Skeletal Muscle Structure Composed of muscle cells (fibers), connective tissue, blood vessels, nerves Fibers are long, cylindrical, multinucleated Striated appearance due to light and dark banding
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9-5 Muscle fiber Artery Vein Nerve Epimysium Perimysium Endomysium Muscle fiber) Fasiculus Capillary Axon of motor neuron Sarcolemma Synapse or neuromuscular junction
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9-6 Sarcomere Endomysium Perimysium Epimysium Skeletal muscle Muscle fibers Myosin myofilament Actin myofilament Actin myofilament Z disk Myosin myofilament M line Cross-bridge Titin filament Z disk Sarcomere Nuclei Capillary Sarcolemma Mitochondrion Myofibrils Striations Sarcoplasmic reticulum Fasciculi
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9-7 Sarcomere Cross-bridge Myosin myofilament Actin myofilament Z disk Z disk Myosin molecule Myosin myofilament (thick) Actin myofilament (thin) F actin strands Tropomyosin Troponin Attachment sites Tropomyosin Rod Light chains Coiled-portion of the two helices Troponin G actin molecules Hinge region of myosin Heads Two heavy chains (a) (b) (c)
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9-8 Actin myofilament (thin) F actin strands Tropomyosin Troponin Attachment sites Tropomyosin Troponin G actin molecules Actin Myofilaments
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9-9 Myosin Myofilaments Myosin molecule Myosin myofilament (thick) Rod Light chains Coiled-portion of the two helices Hinge region of myosin Heads Two heavy chains
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9-10 Sarcomere Myofibrils Mitochondria Z disk Z disk A band H zone M line Rod portion of myosin myofilaments and M line I band Myosin myofilaments only Actin myofilaments only Myosin myofilaments surrounded by actin myofilaments (a) (b) (c) Z d is k M lin e H z o n A b a I b
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9-11 Sarcomeres Z disk : attachment for actin myofilaments
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17 Skeletal Muscle Psysiology - Muscular System Histology...

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