Blood Poster

Connor Tramel

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The Role of Blood in Forensics

Blood is a crucial element of forensic science, as forensic scientists must deal with blood splatter patterns, blood drip stains, and blood transfer patterns. Because blood is considered individual evidence, it can generally prove someone guilty or innocent in a crime. The blood found at a crime scene means nothing, however, unless the forensic scientists are able to collect it properly and leave it uncontaminated.
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Vocabulary

Serology:

The scientific study or diagnostic examination of blood serum, especially with regard to the response of the immune system to pathogens or introduced substances.


Plasma:

Blood plasma is a straw colored liquid component of blood that normally holds the blood cells in suspension. It makes up about 55% of the body's total blood volume.


Antibodies:

a blood protein produced in response to and counteracting a specific antigen. Antibodies combine chemically with substances that the body recognizes as alien, such as bacteria, viruses, and foreign substances in the blood.

Famous case

A well-known case where blood was the determining factor in court is the Christopher Vaughn case. Vaughn shot his wife and three children in his car, but he claimed that his wife killed the children and then herself. The forensic blood splatter analysts were able to look at the blood marks all over the car and piece together a picture that is very different than the one Vaughn painted. As a result Vaughn was sentenced to life in prison for the murder of his family. Blood doesn't lie in crime scenes, and many criminals are too stupid to realize this.
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Vocabulary

Antigen:

a toxin or other foreign substance that induces an immune response in the body, especially the production of antibodies.



Erythrocytes:

a red blood cell that (in humans) is typically a biconcave disc without a nucleus. Erythrocytes contain the pigment hemoglobin, which imparts the red color to blood, and transport oxygen and carbon dioxide to and from the tissues.


ABO:

The ABO blood group system is the most important blood type system (or blood group system) in human blood transfusion.

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Fun Facts

  • The first studies of blood splatter analysis began around 1895
  • There is a difference between blood spatter patterns, blood drip stains, and blood transfer patterns
  • The surface on which blood lands can have a strong impact on how well it can be interpreted
  • A human must lose approximately 40% of his or her total blood volume before they are at risk for death from blood loss
  • Blood spatter analysis can be essential in determining the type of weapon used during a crime

Vocabulary

Rh:

Rhesus (Rh) factor is an inherited protein found on the surface of red blood cells. If your blood has the protein, you're Rh positive. If your blood lacks the protein, you're Rh negative. Rh positive is the most common blood type.


Leukocytes:

a colorless cell that circulates in the blood and body fluids and is involved in counteracting foreign substances and disease; a white (blood) cell.


Platelets:

a small colorless disk-shaped cell fragment without a nucleus, found in large numbers in blood and involved in clotting.

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Vocabulary

Hemoglobin:

a red protein responsible for transporting oxygen in the blood of vertebrates.


Blood factors:

the different types of blood that people have and what those variations consist of.


Serum:

the blood serum of an animal, used especially to provide immunity to a pathogen or toxin by inoculation or as a diagnostic agent.