1 Unit 5 Chapter 11 Death: Manner, Mechanism, Cause, and Time By the end of this chapter you will be able to: Essential Question(s) Enduring Understanding(s) Discuss the ways in which a person can die. Explain how time of death can be determined. Describe the roles of a forensic pathologist, forensic entomologist and forensic anthropologist in a crime scene investigation. Describe how bones can Forensic investigators must determine the time and cause of death and understand that death can occur in many different ways. Insect evidence and environmental factors must be considered when approximating the time of death. There are visible differences
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1 Unit 5 Chapter 11 Death: Manner, Mechanism, Cause, and Time By the end of this chapter you will be able to: Essential Question(s)Enduring Understanding(s)
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Unit 5 Chapter 11 Death: Manner, Mechanism, Cause, and Time By the end of this chapter you will be able to:
Essential Question(s) Enduring Understanding(s) Discuss the ways in which a person
can die. Explain how time of death can be
determined. Describe the roles of a forensic
pathologist, forensic entomologist and forensic anthropologist in a crime scene investigation.
Describe how bones can provide insight into the life and death of a person.
Forensic investigators must determine the time and cause of death and understand that death can occur in many different ways.
Insect evidence and environmental factors must be considered when approximating the time of death.
There are visible differences between the male and female skeleton, especially the skull, jaw, brow ridge, pelvis and femur.
Many factors affect when rigor mortis sets in and how long it lasts:
– Ambient temperature – The weight of the body – The body’s clothing or lack of it – Any illness the person had at the time of death – The level of physical activity at the time of death – Sun exposure
Based on these specifics, give an estimate for each of these on how much time has passed since the meal was eaten: 1. Food is still present in the stomach. 2. The stomach is empty but food is found in
the small intestine. 3. The small intestine is empty but waste is
Informational Source: http://naturalsciences.org/files/documents/csi_tg_overview.docImages: Top Left - http://www.scienceinschool.org/repository/images/issue2forensic3_large.jpg, Middle-Left: http://forensicfact.files.wordpress.com/2008/04/blowfly053.jpg, Top Right - http://users.usachoice.net/~swb/forensics/P1.jpg, Bottom - http://www.deathonline.net/decomposition/corpse_fauna/flies/index.htm
Because scientists know how long it takes for the various stages of development at given temperatures, forensics entomologists can determine when the insects arrived.
Because life cycles are affected by fluctuations in the daily environmental conditions, insect evidence cannot provide an exact time of death.
Insect evidence, nonetheless, can yield a close estimate.