SCI GCU Final Exam 4..docx

SCI GCU Final Exam 4.

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