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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 |