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Anatomy > BLOODSTAIN PATTERN ANALYSIS > Flashcards

BLOODSTAIN PATTERN ANALYSIS Flashcards

1
Q

What is blood pattern analysis

A

-ACTIVITY AT SCENE
-NUMBER OF BLOWS
-POSITION OF VICTIM
-WEAPN CHARACTERISTICS
THE USE OF BIOLOGY, PHYSICS AND MATHEMATICS TO INTERPRET BLOODSTAIN PATTERNS

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2
Q

WHAT IS BLOOD MADE UP OF

A

BLOOD IS MADE UP OF FLUID PLASMA AND CELLS (RIGID SHAPE)

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3
Q

NEWTONIAN

A

ZERO SHEAR RATE
ZERO SHEAR STRESS

VISCOSITY: CONSTANT

WATER AND AIR

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4
Q

NON NEWTONIAN FLUIDS

A

VARIABLE RELATIONSHIP WITH SHEAR STRESS

VISCOSITY: VARIABLE
BLOOD AND TOOTHPASTE

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5
Q

VISCOSITY

A

MEASURE OF FLUID RESISTANCE TO FLOW

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6
Q

SHEAR STRESS

A

A FORCE causing deformation of a material by slippage
along a plane or planes parallel to the imposed stress

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7
Q

BASIC PRINCIPLES

A

a free falling drop of blood forms a sphere or ball

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8
Q

LOW VELOCITY SPATTER

A

5ft/second and usually 3 mm or greater in diameter indicates blood is dripping

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9
Q

MEDIUM VELOCITY SPATTER

A

5-25 ft/second with a diameter of 3 mm and usually
indicates blunt trauma, sharp, trauma and cast-off

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10
Q

HIGH VELOCITY SPATTER

A

100ft second with a spatter of 1 mm in diameter indicating gunshot trauma, power tools, and object striking with extreme velocity

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11
Q

what is the role of plasma

A

to transport nutrients and hormones

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12
Q

what is the definition of a bloodstain pattern

A

a grouping of bloodstains indicating deposition

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13
Q

why are blood stains important in violent crime reconstruction

A

they provide dna evidence

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14
Q

what is passive pattern

A

Bloodstains that result from gravity acting on an injured body, such as drops, flows, pools, and clots

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15
Q

which properties of human blood are considered when analyzing bloodstain patterns

A

biological and physical properties

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16
Q

what results in a bloodstain

A

liquid blood coming in contact with a surface

17
Q

what are the four main components of blood

A

plasma, red blood cells, white blood cells, platelets

18
Q

what is Bloodstain Pattern:

A

a grouping of bloodstains that indicates through form, order, or arrangement, the manner in which the pattern was deposited”

19
Q

Bloodstain Pattern Analysis (BPA):

A

BPA can help reconstruct the sequence of events

BPA can corroborate or refute statements

The study focuses on analyzing bloodstains’ shapes, sizes, locations, and distribution patterns to understand the physical event that led to their occurrence.

20
Q

Target surface

A

The physical characteristics of the surface that is coming in contact with the blood

21
Q

what is drip stain

A

a bloodstain resulting from a falling drop
formed due to gravity

22
Q

what is drip trail

A

a bloodstain pattern resulting from the
movement of a source of drip stains between two
points

23
Q

what is drip pattern

A

a bloodstain pattern resulting from a
liquid dropped into another liquid, at least one of
which is blood

24
Q

what is flow

A

a bloodstain pattern resulting from the
movement of a volume of blood

25
Q

what is pool/saturation

A

when blood collects on a level and undisturbed
surface

when a pool of blood is absorbed through the
surface of the object

26
Q

transfer patterns

A

A pattern created when a bloody surface comes in contact with another surface

27
Q

Swipe

A

A pattern resulting from the transfer of blood from a bloodied surface onto
another surface

28
Q

Wipe

A

A pattern resulting from an object moving through a pre-existing bloodstain

29
Q

Impact spatter

A

A blood stain pattern resulting from an object striking liquid blood

30
Q

Cast-off pattern

A

Created when blood is flung from a blood-bearing object in motion onto a
surface

31
Q

SPATTER PATTERNS

A

External force on an open source of blood

An airborne drop of blood created by an external force

32
Q

What is expected overall shape of a bloodstain that was impacted the target at a 90-degree angle

A

Blood falls as a sphere

33
Q
A

Anatomy (8 decks)

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