blood and blood spatter

agglutination

cells clumping because of antigen-antibody response

angle of impacct

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

antibodies

proteins secreted by WBCs that attach to antigens

antigen

substance that provokes an immune response in the body

antigen-antibody response

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

area 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

area of origin

location of blood source viewed in 3 dimensions by projecting angles

cast-off pattern

blood projected onto a surface as a result of being flung by an object in motion

passive drop

blood drop that is created as a result of gravity

satellite

smaller droplets of blood projected from larger drops of blood

spine

elongated blood streak radiating away from center of blood stain

swipe

blood pattern resulting from lateral transfer

wipe

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