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Structure and Function of Skeletal Muscle

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Presentation on theme: "Structure and Function of Skeletal Muscle"— Presentation transcript:

1 Structure and Function of Skeletal Muscle

2 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

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

4

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

6

7 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

8

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