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Understanding Striated Muscles: Structure and Functions

Learn about the striated appearance of skeletal muscle under a microscope and explore the structure of skeletal, cardiac, and smooth muscles through a straw model. Discover the sliding filament theory, myofilaments, and the role of calcium in cardiac muscle contraction.

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Understanding Striated Muscles: Structure and Functions

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  1. Muscles

  2. The word “striated” means striped. Skeletal muscle appears striped under a microscope.

  3. Skeletal Muscle

  4. Skeletal Muscle Structure

  5. Skeletal Muscle Structure

  6. This model of the muscles uses straws to represent fibers. Green = endomysiumYellow = perimysiumBlue = epimysium

  7. Cardiac Muscle

  8. Cardiac Muscle • Intercalated discs

  9. Cardiac Muscle

  10. Smooth Muscle (2 varieties)

  11. Smooth Muscle (2 varieties)

  12. Myofilaments(2 types)

  13. SLIDING FILAMENT THEORY (MODEL)

  14. Actin myosin https://www.youtube.com/watch?v=CepeYFvqmk4 https://www.youtube.com/watch?v=YAJ-9nPSqwA

  15. Sliding Filament Handout

  16. Sliding Filament Handout

  17. Cardiac Muscle (Ca) • Over half of the calcium which the cardiac cell uses for contraction originates from outside of the muscle cell. • During relaxation much of the calcium will be pumped out of the cell (rather than back into the endoplasmic reticulum.) • Calcium and sodium ions slowly leak through the membrane • When enough of these ions enter, contraction will occur.  • The faster the ions leak into the cell, the faster the cell will contract

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