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Title: A2 Level (Unit 4) FORENSIC SECTION Question and Answers
Description: A2 Level Biology Unit 4 - The Natural Environment and Species Survival Forensic Science Section Really easy, fast and effective revision resource. Questions and Answers!
Description: A2 Level Biology Unit 4 - The Natural Environment and Species Survival Forensic Science Section Really easy, fast and effective revision resource. Questions and Answers!
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Unit 4 – The Natural Environment and Species Survival
FORENSIC SCIENCE
What can be used to estimate time of death?
-Rigor mortis
-Body temperature
-State of decomposition
-Entomological evidence
What is the natural human core body temperature range?
-36
...
6C
What graphical shape does the cooling of the body follow?
-Sigmoid curve
What factors can affect post-mortem cooling?
-Body size
-Body position
-Clothing
-Air movement
-Humidity
-Temperature of surroundings
-Immersion in water will cool the body much more rapidly
...
How does this change respiration in the cells?
-It changes to anaerobic respiration and produces lactic acid
...
What happens to the ATP production?
-It is no longer produced meaning that muscle contraction is no longer possible
...
How do the proteins become fixed?
-They can no longer move over one another to shorten the muscle
...
When the body is warm but not stiff what is the approximate time since death?
-Less than 3 hours
When the body is warm but stiff what is the approximate time since death?
-Between 3-8 hours
When the body is cold and stiff what is the approximate time since death?
-Between 8-36 hours
When the body is cold and not stiff what is the approximate time since death?
-More than 36-48 hours
...
How are enzymes that result in decomposition released?
-Bacteria from the gut and gaseous exchange system rapidly invade the tissues after death
...
How does the green discolouration occur?
-The formation of sulphaemoglobin in the blood
...
What is the third sign of decomposition?
-The colour changes again to purple-black
...
What is the fourth sign of decomposition?
-The body becomes smelly and bloated
...
What is the final stage of decomposition?
-The tissues further decompose, releasing gas and deflating the body
...
-Gas formation occurs after about a week
...
Title: A2 Level (Unit 4) FORENSIC SECTION Question and Answers
Description: A2 Level Biology Unit 4 - The Natural Environment and Species Survival Forensic Science Section Really easy, fast and effective revision resource. Questions and Answers!
Description: A2 Level Biology Unit 4 - The Natural Environment and Species Survival Forensic Science Section Really easy, fast and effective revision resource. Questions and Answers!