Chapter 8- Blood and Blood Spatter

Wipes

Smeared blood pattern created when an object moves through blood that is not completely dried

Adhesion

The attraction between molecules of unlike substances

Angle Of Impact

Angle at which blood strikes a target surface relative to the horizontal plane of the target surface

Antigens

Substance that provokes an immune response in the body

Area of Convergence

Two-dimensional view of the intersection of lines formed by drawing a line through the main axis of at least two drops of blood that indicates the general area of the source of the blood spatter

Antibodies

Proteins secreted by white blood cells that attach to specific antigens

Agglutination

Clumping of cells caused by an antigen–antibody response

Antigen–antibody response

Reaction in which antibodies attach to specific antigens; causes agglutination in cross blood-type transfusions

Area of Origin

Location of the blood source viewed in three dimensions as determined by projecting angles of impact of individual bloodstains

Cohesion

the attraction between molecules of like substances

Satellites

Smaller droplets of blood projected from larger drops of blood upon impact with a surface

Swipe

Blood pattern resulting from a lateral transfer from a moving source onto another surface

Cast-off-patterns

Bood projected onto a surface as a result of being flung from an object in motion

Passive Drop

Blood drop created solely as a result of gravity

Spines

Elongated blood streak radiating away from the center of a bloodstain