click below
click below
Normal Size Small Size show me how
forensics ch. 8
Term | Definition |
---|---|
agglutination | clumping of molecules or cells caused by an antigen-antibody reaction |
antibodies | proteins secreted by white blood cells that attach to antigens |
antigen-antibody response | a reaction in which antibodies attach to antigens |
antigens | any foreign substances or cell in the body that reacts with antibodies |
cell-surface proteins | proteins embedded in the cell membrane |
lines of convergence | two dimensional view of the intersection of lines formed by drawing a line through the main axis of at least 2 drops of blood that indicates the general area of the source of the blood splatter |
point of origin | three dimensional view formed using lines of convergence and angles of impact of at least 2 different drops of blood to identify the source and location of blood splatter. |
red blood cells | donut shaped cells that carry oxygen throughout the body |
satellite drop of blood | secondary drop formed when some blood breaks free from the main contact drop of blood |
white blood cells | cells that police the body by destroying foreign materials |
Rh factor | type of red blood cell protein found in 85% of the population found in 1940 by Alexander Weiner while working with Rhesus monkeys |
High velocity blood splatter | droplet size is less than 1 mm, velocity is 100 ft/sec and could come from a gunshot wound |
Medium velocity blood splatter | droplet size is between 1 and 4 mm, velocity is 25 ft/sec and could come from a beating or stabbing |
Low velocity blood splatter | droplet size is between 4-6 mm, velocity is 5 ft/sec and could come from a blunt object impact |