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BELLWORK

BELLWORK. Name the following movements: Increasing angle of joint (ex. Straightening arm) Moving around longitudinal axis: Moving a limb away from midline of body:. Microscopic Structure and Muscle Contraction. Muscle Structure. Muscle Fascicle (Muscle bundles)

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BELLWORK

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  1. BELLWORK • Name the following movements: • Increasing angle of joint (ex. Straightening arm) • Moving around longitudinal axis: • Moving a limb away from midline of body:

  2. Microscopic Structure and Muscle Contraction

  3. Muscle Structure • Muscle • Fascicle (Muscle bundles) • Muscle fibers (muscle cells) • Myofibrils • Myofilaments (thick and thin)

  4. Sarcolemma • Cell membrane of skeletal muscle cells

  5. Microscopic Structure • 1 muscle fiber = many myofibrils • 1 myofibril = many thick and thin filaments • The thick and thin filaments form the smallest functional unit of muscle the sarcomere

  6. Thick and Thin Filaments • Made of proteins • Structural: make up the structural framework of muscles • Contractile: involved in the process of contraction • Regulatory: not part of contraction, but they regulate it

  7. Myosin & Actin • Actin (thin filament) has binding sites for myosin

  8. Sliding Filament Theory • 1950s – scientists observed that the length of thick and thin filaments stayed the same during muscle contraction • This led to the Sliding Filament Theory: • During muscle contraction, the thick and thin filaments do not shorten, but slide on one another which results in the shortening of the sarcomere and the entire muscle

  9. Sliding Filament Theory • 1. Myosin head binds to ATP • 2. Myosin head gets energized

  10. Sliding Filament Theory • 3. Crossbridge forms between myosin head and actin

  11. Sliding Filament Theory • 4. Power stroke causes filaments to slide

  12. Sliding Filament Theory • 5. Another ATP molecule binds to myosin head causing it to release from actin and return to original position

  13. Sliding Filament Theory • http://www.youtube.com/watch?v=Ct8AbZn_A8A

  14. Sliding Filament Theory • How is the sliding filament theory similar to these doors?

  15. Regulation • Troponin and Tropomyosin (regulatory proteins) depend on Calcium ions • Troponin: has binding site for calcium ions • Tropomyosin: covers binding site on actin

  16. Calcium ions • What would happen if there are no Calcium ions present?

  17. 6 most important chemicals (molecules): • Myosin, actin, tropomyosin, troponin, ATP, Calcium

  18. Exit Ticket • Kahoot.it

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