Blood Spatter (ch 7)

Question 1

blood typing is what type of evidence
what id DNA profiling

Answer 1

class
individual

Question 2

a blood spatter pattern can give info about

Answer 2

truthfulness, origin of blood, angle and velocity of impact, and type of weapon

Question 3

whole blood carries

Answer 3

cells and plasma

Question 4

plasma

Answer 4

the fluid with hormones, clotting factors, and nutrients

Question 5

red blood cells

Answer 5

carry oxygen to the bodys cells and cardon dioxide away (5-6 million)

Question 6

white blood cells

Answer 6

fight disease and foreign invaders and, alone, contain cell nuclei (5000-10000)

Question 7

platelets

Answer 7

aid in blood clotting and teh repair of damages blood vessels (250,000-400,000)

Question 8

Blood type vs dna profiling

Answer 8

bllod type–quicker and less $$, produces class evidence but can still link a suspect or exclude suspect

Question 9

Karl Landsteiner

Answer 9

-1900
-discovered there is more than one blood type because he blood didn;t mix freely w another
-1901
-identified A and B cell surface proteins

Question 10

type a

Answer 10

42%

Question 11

type b

Answer 11

12%

Question 12

Type ab

Answer 12

3%

Question 13

type O

Answer 13

43%

Question 14

Rh+, Rh-

Answer 14

85 %
-either have it or don’t

Question 15

A and B proteins

Answer 15

-two proteins embedded in cell membranes of red blood cells
-type o neither

Question 16

Probability of blood types

Answer 16

• can limit the size of a suspect population
  -multipky decimals and *100

Question 17

Blood spatter has been used in cases since

Answer 17

1894

Question 18

in ____ the meaning of the splatter pattern was analyzed

Answer 18

1939

Question 19

splatter pattern

Answer 19

• takes grouping of blood stains
• help reconstruct events surrounding crime

Question 20

blood spatter analysis

Answer 20

• dierction blood traveled
  -angle of impact
• point of origin of the blood
  -velocity of the blood
  -manner of death

Question 21

when blood dropped from 90 degrees it forms

Answer 21

round droplets

Question 22

satellite droplets

Answer 22

smaller blood droplets that are ejected from a larger volume drop when that drop hits a surface.
-happens when blood falls from heogh or high velocity

Question 23

spiking patterns

Answer 23

blood falls on less than smooth surface

Question 24

passive drops

Answer 24

circular with secondary satellites

Question 25

arterial gushes

Answer 25

spurt like at varying heights

Question 26

splashes

Answer 26

like exclamation points

Question 27

smears

Answer 27

touches/brushes against a firm surface

Question 28

trails

Answer 28

round, smeared, or even spurts

Question 29

pools

Answer 29

large amounts left by the victim in one spot

Question 30

cohesion

Answer 30

blood attracting to blood

Question 31

adhesion

Answer 31

blood attracted to surface

Question 32

surface tension

Answer 32

causes the blood drop to pull itself in; both horizontally and vertically. The blood drop will settle into a spherical shape, as a result of the surface tension. The surface tension will maintain the sphere shape of the blood drop until it impacts with the. surface.

Question 33

point of origin

Answer 33

where blood originated
- can be determined by measuring the width and length of droplet

Question 34

High velocity

Answer 34

-less than 1 mm
100 ft/sec
ex: gunshot wounds

Question 35

mediun

Answer 35

1-4 mm
25 ft/sec
beating, stabbing

Question 36

low

Answer 36

4-6
5 ft/sec
blunt object impact

Question 37

luminol

Answer 37

causes hemoglobin to fluresce under black light

Question 38

4 steps in investigating blood at crime scene

Answer 38

confirm that the stain is blood
confirm that the blood is human blood
determine the blood type
see if blood matches suspect; perform a DNA analysis if necessary and suspect can be excluded

Question 39

Kastle-meyer test

Answer 39

if stain is blood turns a dark pink

Question 40

leukomalachite green

Answer 40

changes color to green when blood is present