AIM: HOW CAN BLOOD BE USED IN FORENSICS?
Transcript of AIM: HOW CAN BLOOD BE USED IN FORENSICS?
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AIM: HOW CAN BLOOD BE USED IN FORENSICS?
March 17, 2014 Do Now: What is blood? What does blood do in
our body?
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AGENDA• Blood as Evidence
• What is blood?
• Function of the Circulatory System
• Function of Blood
• Blood Components
• CSI introduction
• Exit Slip
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UNIT 3: BLOOD
Goals: Be able to test blood using blood typing and blood spatter analysis to solve criminal cases.
Labs: Blood Typing, Blood Spatter, CSI Investigation
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WHAT IS BLOOD?• Connective tissue that transports oxygen and
nutrients to cells, and removes waste from cells
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THE CIRCULATORY SYSTEM
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THE CIRCULATORY SYSTEM
•Organ system responsible for delivering nutrients, hormones, and gases to and from cells.
• Maintains homeostasis
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THE CIRCULATORY SYSTEM• Major Organs:
• Heart
• Lungs
• Blood Vessels
• Arteries
• Veins
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ARTERIES• Take blood away from heart
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VEINS• Take blood to the heart
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HEART• Muscle that pumps blood by rhythmic contractions
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LUNGS
• Give blood oxygen
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BLOOD AS EVIDENCE
1. DNA from White Blood Cells (WBC’s)
2. Blood Typing
3. Blood Splatter Analysis
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WHAT IS BLOOD MADE OF?
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BLOOD COMPONENTS• Blood is made up of:
• Plasma
• Erythrocytes (RBC)
• Leukocytes (WBC)
• Platelets
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ERYTHROCYTES• Red Blood Cells
• Carry oxygen to cells, take CO2 from cells
• Lack nuclei and most organelles
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LEUKOCYTES
• White Blood Cells
• Prevent infection, remove cellular waste, cause allergic reactions
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PLATELETS
• Cell fragments
• Help repair damage to the circulatory system
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PLASMA• Transports cells and all other items in blood, such as nutrients, proteins, hormones, waste, and clotting factors
• Mostly water
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CSI CASE: IN COLD BLOOD• Date: March 17, 2014
• Time: 5:00 A.M.
• Location: East River Park
• Victim: Patrick O’ Bama
• Evidence: Blood stains and samples
• Cause of Death: Unknown
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EXIT SLIP
1. What are the 3 ways that blood is used in forensic science?
2. What is the major function of the circulatory system?
3. What are the 4 major organs of the circulatory system?
4. What are the 4 components of blood?