Aim: SWBAT describe the stages of decomposition of a corpse
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Transcript of Aim: SWBAT describe the stages of decomposition of a corpse
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Aim: SWBAT describe the stages of decomposition of a corpse Date: May 7, 2013Do Now: 1. Get out the worksheet from
yesterday. 2. Calculate the time of death for a
body found at 26° C.
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16 hours and 12 minutes
Solution
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Homework Review Decomposition Introduction
Eye Changes Stages of Decomposition Red Light
Agenda
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1. 5 hours2. Before 5 hours3. 14 hours 14 minutes4. 31 hours 42 minutes5. 57 hours 24 minutes6. 9 hours 42 minutes7. 16 hours 36 minutes8. A) Reduce B) Reduce C) Increase D) Reduce
Homework Review
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Breakdown of tissue, organs, and other remains
http://www.youtube.com/watch?v=KkNdCSW1n_g
Decomposition
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Eye dries out, thin film forms over it
Forms within 2-3 hours if open at death, 24 hours if closed
Potassium buildup in the eye
Changes in the eye
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Answer the following in your notebooks:As forensic scientists, how can we utilize the information from sites like the body farm in our investigation?
Red Light
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http://www.youtube.com/watch?v=7e6jxW07RdU
Stages of Decomposition
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1. Within two days (Initial Decay)a. Livor Mortisb. Discoloration in facec. Marbling of skind. Cell Death
Stages of Decomposition
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2. Four days ( Putrefaction)a. Blistersb. Stomach swells with gas from
bacteria
Stages of Decomposition
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3. 6 – 10 Days (Black Putrefaction)
a. Gases build upb. Chest and Stomach burst and collapsec. Fluids leak from bodyd. Eyes liquefye. Skin sloughs off
Stages of Decomposition
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4. After 10 days (Butyric fermentation)
a. Corpse starts to dry out, flesh is gone5. Eventually (Dry decay)
a. Corpse is dry, little decay
Stages of Decomposition
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Answer the following in your notebooks:1. How can we recognize the first stage of
decomposition?2. Describe the second stage (putrefaction) of
decomposition?3. How does the body change from the second
stage (putrefaction) to the third stage (black putrefaction) of decomposition?
4. In your own words, describe what occurs during the fourth (Butyric fermentation) and fifth (Dry decay) stages of decomposition.
Red Light