Structure and Function of Skeletal Muscle

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Presentation transcript:

Structure and Function of Skeletal Muscle

Skeletal Muscle Human body contains over 400 skeletal muscles 40-50% of total body weight Functions of skeletal muscle Force production for locomotion and breathing Force production for postural support Heat production during cold stress

Structure of Skeletal Muscle: Connective Tissue Covering Epimysium Surrounds entire muscle Perimysium Surrounds bundles of muscle fibers Fascicles Endomysium Surrounds individual muscle fibers

Structure of Skeletal Muscle: Microstructure Sarcolemma Muscle cell membrane Myofibrils Threadlike strands within muscle fibers Actin (thin filament) Troponin Tropomyosin Myosin (thick filament)

Structure of Skeletal Muscle: The Sarcomere Further divisions of myofibrils Z-line A-band I-band Within the sarcoplasm Sarcoplasmic reticulum Storage sites for calcium Transverse tubules Terminal cisternae