CHE1131PATHOLOGY3

CHE1131PATHOLOGY3 - remains 12-24 h. Algor Mortis Body...

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CHE113 Forensic Science Nicolas Canel Forensic Pathology Time of Death Can estimate time of death from • body temperature (algor mortis) estimate: [98.6 o F – rectal temp]/1.5 Rigor mortis (temp. dependent, muscle fibers become cross-linked and fused/ATP depletion, muscles stiffen/not contract. First noticed 2-4 hrs pm, max 8 -12 hr., remains 12-24 h. •insect action (forensic entomology) • stomach contents (stage of digestion) • last known activity (last sighting, newspaper/mail) • normal postmortem changes Rigor Mortis Rigor mortis (temp. dependent): muscle fibers become cross-linked and fused/ATP depletion, muscles stiffen/not contract. First noticed 2-4 hrs pm, max onset 8 -12 hr.,
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Unformatted text preview: remains 12-24 h. Algor Mortis Body Temperature Changes: Postmortem body temperature drops ca. 1.5 F per hr (normal conditions - slower in clod conditions). Faster in water. Affected by wind and insulation. Initial temperature may be abnormal altering calculation (fever). May rise in hot environments . Livor Mortis (Lividity) Livor mortis Gravity causes blood to settle in vessels 1 - 2 hrs. Color changes in skin Pressure changes color early on (blanching) blanching halts 8 -12 hrs Decomposition Autolysis - normal internal process Putrefaction - bacterial decomposition Various stages (fresh, bloated, etc.) Insects and animal action...
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