Presentation on theme: "Death: Meaning, Manner, Mechanism, Cause, and Time"— Presentation transcript:
1Death: Meaning, Manner, Mechanism, Cause, and Time
2Did You Know?As late at the 17th century people were often buried alive (no stethoscopes)Weak heartbeats, comaLead to practice of burying people in coffins with a bell.May have led to the expression, “saved by the bell!”
3Real Life CSI: Crime Autopsy VideoReal Life CSI: Crime Autopsy
4Death Defined Death- Cessation, or end, of life Irreversible cessation of circulation of bloodHeart stops beating and cannot be restartedNo Oxygen source to cellsCessation of brain activityCessation of all brain activityExperts do not agree on a single definition of deathA TOUGH QUESTION- Is a person with a heartbeat alive even if there is no brain activity?
5Stages of DeathIt is difficult to pinpoint the exact point at which someone has died, death is a process rather than an instant event.The moment of death is usually considered the point of no return2 StagesStoppage- basic processes of body fail to occurCaused by lack of oxygen as cells throughout the body begin to die (No ATP)Eventually nerves, muscles, organs and the brain stop workingAutolysis- Cells breaking downAs a cell dies it breaks downAs the cell membrane dissolves, enzymes and other cell contents spill out and digest surrounding tissuesOnce enough cells begin to break down, life cannot be restarted
6Manner of Death The manner of death can be… Natural- most commonInterruption and failure of body functions resulting from age or disease.AccidentalUnplanned events such as car accidents or falling from a ladderSuicidalA person purposely kills oneselfCan be difficult to determine (accidental vs suicidal)HomicidalA person or persons kills another person or personsUndeterminedSometimes the manner of death can be difficult to determine
7Questions To Ponder???A man with a heart condition is attacked and dies form a heart attack during the assault. Is the manner of death accident or homicide?An elderly woman dies after being kept form receiving proper health care from her son.
8Cause and Mechanism of Death Cause of Death- The reason for the death.Disease, physical injury, heart attack ect..Blunt force trauma, shooting, strangulation ect…Mechanism- is the specific change in the body that brought about the cessation of lifeBlood lost, pulmonary arrest (heart stops beating) ect…
9Forensic Pathology Investigation of the sudden, unnatural, unexplained or violent deaths AutopsyExternal and internal examination of the body of the deceased person.Performed by a specialized medical doctor called a FORENSIC PATHOLOGIST (commonly known as medical examiner or coroner) in cases of suspicious or unnatural deathsPrimary purpose is to determine or confirm…Time of Death (TOD)can incriminate or exonerate a suspect or person of interestManner, cause and method of deathMay include inspection of stomach contentsTime of DeathMay also include obtaining biological specimens or tissues from the deceased for toxicological testingTesting for poisons and/or drugs and alcohol
10The Anatomy Lesson of Dr The Anatomy Lesson of Dr. Nicolaes Tulp, by Rembrandt, depicts an autopsy
11We’ll talk more about these specialists and their roles later Also may be involved…Forensic AnthropologistIdentification and examination of human skeletal remains.EntomologistSpecialists in the study of insects can help determine time of death.We’ll talk more about these specialists and their roles later
12Lab TomorrowTomorrow we will be performing an autopsy. We must familiarize ourselves with the following anatomical terms