Topic 6 - Determining time of death

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  • Created by: sakiya
  • Created on: 23-01-19 16:56
What causes decomposition?
Autolysis: enzymes in the body break down cells. The invasion of bacteria (anaerobically and aerobically respiring).
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What are the signs of decomposition?
Discolouration, bloating, shrinking.
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What causes discolouration and when is it visible?
The release if sulfhemoglobin in the blood causes the lower abdomen to turn a greenish colour this usually takes place 36-72 hours after death.
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What causes bloating?
Different bacteria cause different chemical reactions to occur. In the process they release large amounts of gases and liquids in the body (forming gas and liquid blisters to appear on the skin).
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What is forensic entomology?
The study of insects.
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How is forensic entomology useful in estimating the time of death?
The stage in which the insect is in its life cycle can determine the time of death.
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What is used to determine the rate of insect development?
The temperature of the air, ground, body, the species of insect and its mass can help determine the rate of insect development.
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What temperature is the body usually found in?
Between 36.2 and 37.6 degrees
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How can the core body temperature be distinguished?
Via a rectum thermometer it an abdominal stab.
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What temperature has the body reached when it is no longer cooling?
The ambient temperature (the temperature of the surroundings).
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What can affect the temperature of the body?
The clothing worn, wind speed, humidity of the air, surface area exposed and percentage of body fat.
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What are the factors which can determine the time of death
Rigor mortis, temperature, decomposition and forensic entomology.
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What is rigor morits an when does it occur?
Rigor mortis is the stiffening of muscles and it occurs 6 - 9 hours after death.
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What causes rigor mortis?
Cells are starved of oxygen, cells becoming anaerobic and produce lactic acid, ph lowers inhibiting enzymes, ATP needed for muscle contraction is no longer available so they become fixed.
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Card 2

Front

What are the signs of decomposition?

Back

Discolouration, bloating, shrinking.

Card 3

Front

What causes discolouration and when is it visible?

Back

Preview of the front of card 3

Card 4

Front

What causes bloating?

Back

Preview of the front of card 4

Card 5

Front

What is forensic entomology?

Back

Preview of the front of card 5
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