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Chapter 12, part A

Chapter 12, part A Muscles About this Chapter Muscle types What muscles do How muscles contract Contraction to locomotion Roles of smooth muscles Muscles Contract! Generate motion Generate force Generate heat Support Muscle Types Cardiac – heart Smooth – internal organs

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Chapter 12, part A

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  1. Chapter 12, part A Muscles

  2. About this Chapter • Muscle types • What muscles do • How muscles contract • Contraction to locomotion • Roles of smooth muscles

  3. Muscles • Contract! • Generate motion • Generate force • Generate heat • Support

  4. Muscle Types • Cardiac – heart • Smooth – internal organs • Skeletal – "voluntary" • Attach to bone • Move appendages • Support body • Antagonistic pairs • Flexors • Extensors PLAY Animation: Muscular System: Anatomy Review: Skeletal Muscle Tissue

  5. Muscle Types Figure 12-1: Three types of muscles

  6. Skeletal Muscle Anatomy • About 40% body mass • Muscle fibers – cells • Fascicle – bundle • Motor unit • Muscle • sheath • Attach to tendons (which attach to bone)

  7. Skeletal Muscle Anatomy Figure 12-3a-1: ANATOMY SUMMARY: Skeletal Muscle

  8. Skeletal Muscle Anatomy Figure 12-3a-2: ANATOMY SUMMARY: Skeletal Muscle

  9. Muscle Fiber Structure • Multiple nuclei • Sarcolemma • T-tubules • Sarcoplasmic reticulum • Sarcoplasm • Mitochondria • Glycogen & ions • Myofibrils

  10. Muscle Fiber Structure Figure 12-3b: ANATOMY SUMMARY: Skeletal Muscle

  11. Muscle Fiber Structure Figure 12-4: T-tubules and the sarcoplasmic reticulum

  12. Myofibrils: Site of Contraction • Actin – "thin fibers" • Tropomysin • Troponin • Myosin – "thick fibers" • Tinin – elastic anchor • Nebulin – non-elastic

  13. Myofibrils: Site of Contraction Figure 12-3c-f: ANATOMY SUMMARY: Skeletal Muscle

  14. Sarcomere: Organization of Fibers • Z disks • I band • A band • H Zone • M line • Titin • Nebulin Figure 12-5: The two- and three-dimensional organization of a sarcomere

  15. Sarcomere: Organization of Fibers Figure 12-6: Titin and nebulin

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