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Aim: SWBAT describe the stages of decomposition of a corpse PowerPoint Presentation

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, 2013

Do Now:

Get out the worksheet from yesterday.

Calculate the time of death for a body found at 26° C.

Solution

- Homework Review
- Decomposition Introduction
- Eye Changes
- Stages of Decomposition
- Red Light

- 5 hours
- Before 5 hours
- 14 hours 14 minutes
- 31 hours 42 minutes
- 57 hours 24 minutes
- 9 hours 42 minutes
- 16 hours 36 minutes
- A) Reduce
B) Reduce

C) Increase

D) Reduce

- Breakdown of tissue, organs, and other remains
- http://www.youtube.com/watch?v=KkNdCSW1n_g

- 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

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 LightStages of Decomposition

- Within two days (Initial Decay)
- Livor Mortis
- Discoloration in face
- Marbling of skin
- Cell Death

- Four days ( Putrefaction)
- Blisters
- Stomach swells with gas from bacteria

3. 6 – 10 Days (Black Putrefaction)

a. Gases build up

b. Chest and Stomach burst and collapse

c. Fluids leak from body

d. Eyes liquefy

e. Skin sloughs off

Stages of Decomposition4. After 10 days (Butyric fermentation)

a. Corpse starts to dry out, flesh is gone

5. Eventually (Dry decay)

a. Corpse is dry, little decay

Stages of DecompositionAnswer the following in your notebooks:

- How can we recognize the first stage of decomposition?
- Describe the second stage (putrefaction) of decomposition?
- How does the body change from the second stage (putrefaction) to the third stage (black putrefaction) of decomposition?
- In your own words, describe what occurs during the fourth (Butyric fermentation) and fifth (Dry decay) stages of decomposition.

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