Serology II: Blood Spatter

Question 1

velocity of blood that leaves the smallest droplets as physical evidence

Answer 1

high velocity - faster than 100 ft/sec

Question 2

true or false: spatter from bullet is different depending on whether it is entering or leaving the victim

Answer 2

true

Question 3

velocity of blood that leaves larger drops; it is characterized by speeds of 5 ft/sec or slower

Answer 3

low velocity

Question 4

pattern that is left when an object moves through a partially dried blood stain, removing part of the blood but leaving the stain outline intact

Answer 4

skeletonized stain

Question 5

velocity of blood that is between 5 and 100 ft/sec

Answer 5

medium velocity

Question 6

uses the shapes and sizes of blood drops to reconstruct the crime

Answer 6

blood spatter analysis (BSA)

Question 7

pattern that helps place an object or body in the scene; the area in question lacks blood even though the areas surrounding it shows blood

Answer 7

void pattern

Question 8

pointed edges of a stain that radiate out to form the spatter

Answer 8

spines

Question 9

a large pattern of blood that is created when blood escapes an artery under pressure; the increase and decrease in in pressure is apparent

Answer 9

arterial bleeding

Question 10

term for the surface on which blood ends up

Answer 10

target

Question 11

instrument used to measure angles in blood labs

Answer 11

protractor

Question 12

angle at which a blood droplet strikes a surface

Answer 12

angle of impact

Question 13

random distribution of blood stains that may vary in size and that may be produced by a variety of mechanisms

Answer 13

blood spatter

Question 14

droplet from which the satellite spatter originated

Answer 14

parent drop

Question 15

location of blood surface source by drawing lines from various droplets to the intersection point (2D)

Answer 15

area of convergence

Question 16

parts of blood drops that are also known as elongations - used to determine direction the blood was moving

Answer 16

tails

Question 17

blood spatter on a target as a result of breathing; this usually occurs as a result of an injury to the throat, mouth, or airway

Answer 17

expirated blood

Question 18

which leads to larger droplets in cast-off patterns: lead pipe or golf club?

Answer 18

lead pipe

Question 19

NON-blood-bearing object moves through wet blood stain, altering appearance of original stain, causing smears - like using a clean paper towel to clean a wet surface

Answer 19

wipe

Question 20

also known as the area of origin, a point in space where the blood spatter came from (3D)

Answer 20

point of origin

Question 21

linear patterns formed when the blood is flung from an object

Answer 21

cast-off

Question 22

small drops of blood that break off from the parent spatter when the parent droplet strikes a target surface

Answer 22

satellite spatter

Question 23

a blood-bearing object transfers blood onto a previously blood-free surface

Answer 23

swipe

Question 24

pattern created when a wet, bloody object come in contact with a target surface, leaving a pattern that has the feature of the object, making it useful for identifying the object in question

Answer 24

transfer pattern

Question 25

characteristic patterns present when blood drips into standing wet blood

Answer 25

drip patterns

Question 26

bloodstain patterns resulting from blood drops that travel in the same direction as the impact force

Answer 26

forward spatter

Question 27

blood that is directed back toward the surface of energy/source of engery

Answer 27

blow back

Question 28

relationship between velocity and droplet size

Answer 28

inverse

Question 29

characteristic of low velocity cast-off

Answer 29

linear and uniform

Question 30

direction in which the blood droplet fell

Answer 30

same direction the tail points to

Question 31

angle of impact formula

Answer 31

sin^-1(width/length)