GCU SCI220 Final Exam || with Validated Solutions.
Blood stains are ________ during free fall because of __________. correct answers Spherical;
surface tension
What do blood droplets do during free fall? correct answers They oscillate
Blood will stay ________ until it is acted on by a _________. correct answers Spherical; force
If blood strikes a smooth surface, what type of satellite spatter will it produce? correct answers
Very few
If blood strikes a rough surface, what type of satellite spatter will it produce? correct answers
Lots of spatter
What is the relationship between force and spatter size? correct answers They are inversely
related (the more force applied, the smaller the spatter)
Larger drops have a ________ mass correct answers larger
Droplets with a larger size & mass can travel ___________ than drops with a smaller size &
mass. correct answers Farther
How far can mist blood spatter travel? correct answers Up to 4 feet
What are the 6 general features of blood stains? correct answers 1. Direction of orientation.
2. Angle of blood on surface impact.
3. Location/position of body during bleeding.
4. Movement of bleeding person.
5. Minimum number of blows administered.
6. Approx. location of person inflicting blows.
What are the three main types of blood stains? correct answers Passive, Transfer, and Impact
What are passive blood stains? correct answers Stains due to the force of gravity: drops, flows,
pools.
What are transfer blood stains? correct answers Stains created when an object comes into contact
with the stains: swipe, wipe, pattern transfer.
What are impact blood stains? correct answers Stains created when blood is projected through
the air as a result of force: gushes, spurts.
Which way does the pointed end of a blood stain face? correct answers It faces the traveling
direction.
, What do distorted edges of blood stains indicate? correct answers Indicate the direction of travel.
What would the angle of impact be for a perfect circular drop? correct answers 90 degrees.
Stains become more _________ with ___________ angles. correct answers Elliptical; decreasing
(smaller).
Tails of blood droplets become ______________ with decreasing angles. correct answers
Longer.
What are the 7 specific types of blood spatter? correct answers 1. Cast-off
2. Arterial spray
3. Contact/transfer
4. Blood pools
5. Blood flows
6. Drip/trail pattern
7. Impact
What is a cast-off spatter? correct answers When the blood on an object gets flung onto a
surface. Can be seen when multiple blows are given.
For cast-off spatter, what direction does the pattern point in? correct answers Points in the
direction opposite of blows.
What can a cast-off stain show? correct answers Which hand was used.
What can the width of a cast-off spatter show? correct answers The general type of object used:
larger drop=larger object.
The amount of blood on an object used in a cast-off spatter determines _________ and
__________. correct answers Blood drop size; number of drops in the pattern.
A cast-off spatter may show the __________ number of blows administered. correct answers
minimum.
Why do cast-off stains show the minimum number of blows? correct answers The first blow is
what causes bleeding and will not produce cast-off spatter. Additionally, not all blows contact
the bloody area.
What is an arterial spray spatter? correct answers Spatter caused by injury to a main artery or the
heart.
How does the blood of an arterial spatter compare to blood from other stains? correct answers It
is a bright red color because it is very oxygenated blood.
Blood stains are ________ during free fall because of __________. correct answers Spherical;
surface tension
What do blood droplets do during free fall? correct answers They oscillate
Blood will stay ________ until it is acted on by a _________. correct answers Spherical; force
If blood strikes a smooth surface, what type of satellite spatter will it produce? correct answers
Very few
If blood strikes a rough surface, what type of satellite spatter will it produce? correct answers
Lots of spatter
What is the relationship between force and spatter size? correct answers They are inversely
related (the more force applied, the smaller the spatter)
Larger drops have a ________ mass correct answers larger
Droplets with a larger size & mass can travel ___________ than drops with a smaller size &
mass. correct answers Farther
How far can mist blood spatter travel? correct answers Up to 4 feet
What are the 6 general features of blood stains? correct answers 1. Direction of orientation.
2. Angle of blood on surface impact.
3. Location/position of body during bleeding.
4. Movement of bleeding person.
5. Minimum number of blows administered.
6. Approx. location of person inflicting blows.
What are the three main types of blood stains? correct answers Passive, Transfer, and Impact
What are passive blood stains? correct answers Stains due to the force of gravity: drops, flows,
pools.
What are transfer blood stains? correct answers Stains created when an object comes into contact
with the stains: swipe, wipe, pattern transfer.
What are impact blood stains? correct answers Stains created when blood is projected through
the air as a result of force: gushes, spurts.
Which way does the pointed end of a blood stain face? correct answers It faces the traveling
direction.
, What do distorted edges of blood stains indicate? correct answers Indicate the direction of travel.
What would the angle of impact be for a perfect circular drop? correct answers 90 degrees.
Stains become more _________ with ___________ angles. correct answers Elliptical; decreasing
(smaller).
Tails of blood droplets become ______________ with decreasing angles. correct answers
Longer.
What are the 7 specific types of blood spatter? correct answers 1. Cast-off
2. Arterial spray
3. Contact/transfer
4. Blood pools
5. Blood flows
6. Drip/trail pattern
7. Impact
What is a cast-off spatter? correct answers When the blood on an object gets flung onto a
surface. Can be seen when multiple blows are given.
For cast-off spatter, what direction does the pattern point in? correct answers Points in the
direction opposite of blows.
What can a cast-off stain show? correct answers Which hand was used.
What can the width of a cast-off spatter show? correct answers The general type of object used:
larger drop=larger object.
The amount of blood on an object used in a cast-off spatter determines _________ and
__________. correct answers Blood drop size; number of drops in the pattern.
A cast-off spatter may show the __________ number of blows administered. correct answers
minimum.
Why do cast-off stains show the minimum number of blows? correct answers The first blow is
what causes bleeding and will not produce cast-off spatter. Additionally, not all blows contact
the bloody area.
What is an arterial spray spatter? correct answers Spatter caused by injury to a main artery or the
heart.
How does the blood of an arterial spatter compare to blood from other stains? correct answers It
is a bright red color because it is very oxygenated blood.
