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How Does Rigor Mortis Work?

How Does Rigor Mortis Work?. November 9 th , 2009. Do Now. What is rigor mortis? How do your muscles contract? (what do you remember from Living Environment?). Aim. Why does rigor mortis occur? Learning Target: I can. Agenda. Do Now

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How Does Rigor Mortis Work?

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  1. How Does Rigor Mortis Work? November 9th, 2009

  2. Do Now • What is rigor mortis? • How do your muscles contract? (what do you remember from Living Environment?)

  3. Aim • Why does rigor mortis occur? • Learning Target: • I can...

  4. Agenda • Do Now • Mini Lesson – Muscle Contractions, Mechanism behind Rigor Mortis • Practice – Graphic organizer with diagrams & descriptions

  5. Share out • How do your muscles contract? • When muscle contraction stops working, rigor mortis occurs

  6. What makes up muscles • Thin filiment - actin • Thick filiment - myosin

  7. When you want to pick something up... • Your brain sends a signal for the myosin to stick to the actin

  8. How does the myosin stick to the actin? • Myosin heads bind to actin • Myosin heads form little “cross-bridges”

  9. What’s the purpose of forming crossbridges? • the thick myosin bands pull the thin actin bands closer  muscle contraction. • Works because of the cross bridges. myosin actin

  10. How do your mucles lose the contraction? • Remeber ATP from Living Environment??? • ATP = Adenosine Triphosphate

  11. ATP • Product of cellular respiration. • What’s the purpose of cellular respiration? (dust off those cob-webs) • body converts glucose  energy

  12. What does ATP do? • Breaks these connections between mysin and actin • Allows muscle to relax

  13. What do you think happens when cellular respiration stops? • Stop and jot

  14. What do you think happens when cellular respiration stops?

  15. If there is no ATP, muscles stay contracted. • Why, then, would rigor mortis go away after 36 hours?? • Stop and jot!!!

  16. If there is no ATP, muscles stay contracted. • Why, then, would rigor mortis go away after 36 hours?? • Autolysis - cells start breaking down. • Cell wall breaks down  cell contents leak out. • Muscles do not relax, but are broken down

  17. Autolysis causes... • Muscles to become soft • Muscles don’t relax, but break down. – important distinction!

  18. Lets practice this! • Make a graphic organizer explaining the process of muscle contraction  what goes wrong to cause rigor mortis • What is a graphic organizer?

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