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Do Now:

Objective: (SAME AS YESTERDAY) SWBAT use the evidence of livor mortis, rigor mortis, and algor mortis to calculate the approximate time of death. Do Now:. Describe the causes of rigor mortis. Define livor and algor mortis How can these be used to calculate time of death?. Mortis.

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Do Now:

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  1. Objective: (SAME AS YESTERDAY) SWBAT use the evidence of livor mortis, rigor mortis, and algor mortis to calculate the approximate time of death Do Now: • Describe the causes of rigor mortis. • Define livor and algor mortis • How can these be used to calculate time of death?

  2. Mortis • Mortis refers to death • Rigor Mortis - stiff • Livor Mortis- blueish color • Algor Mortis- coldness

  3. Rigor Mortis

  4. Rigor Mortis • Skeletal muscles partially contract • Joints stiffen, lock in place • Beginning about 2 hours after death • Lasting about 30 hours

  5. Chemistry of Rigor Mortis • Calcium -> ATP • http://www.youtube.com/watch?v=CepeYFvqmk4 • 1:40 • End of rigor mortis

  6. End of Rigor Mortis • Autolysis • decomposition • digestive enzymes • Rupture and release fluids • The muscles relax when the body starts to decompose and the cells begin to break down

  7. STOP! Hold Up! Whoa There! Run That Back RED LIGHT!!!!! • What causes rigor mortis?

  8. Ca and ATP Ratchet the Fibers

  9. 30-15 • 30 seconds to explain • 15 seconds to ask questions • Switch

  10. Why is this useful • Time • Position • Location

  11. Livor Mortis • Heart stops beating which had been mixing blood • Red blood cells are denser so they sink • Maroon to blue color develops at lowest points • Visible 30 minutes 12 hours after death • Tells you if the body was moved.

  12. Livor Mortis • Pressure prevents pooling

  13. Livor Mortis

  14. Livor Mortis • After death cells release enzyme that prevents clotting • Blood in body stays liquid after death

  15. Algor Mortis • Rate of cooling of body after death • 1.5 °F per hour under “normal conditions” • 0.78 Degrees Celsius

  16. Algor Mortis • Clothing • Insulates body from heat loss • Obesity • Fat insulates, temperature falls more slowly • Ratio of surface area to volume • Children, thin people cool faster • In water? • Cooling is faster since water is a better conductor of heat than air

  17. A man is found on the side of the road. His body temperature is 32° C. How long has this man been dead? • A woman is found dead. Her body temperature is 25° C. How long has this woman been dead?

  18. Exit Ticket Be specific • How can rigor mortis be used to calculate death? How can algor mortis be used to calculate death? How can livor mortis be used to calculate death? Show your work 2. How long has a victim been dead, if she was found with a body temperature of 24 degrees Celsius? (R. more)

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