sci 220 exam 4 || QUESTIONS WITH COMPLETE
SOLUTIONS!!
How can you determine the direction of travel for a blood droplet that does not have an
elongated tail? correct answers the more perfect circle of a bloodstain pattern is, the closer it is to
a 90-degree angle of impact. Can also use several tails to determine direction of travel. Distorted
edges indicate travelling direction.
True or False: A medium velocity spatter would be created due to gravity. correct answers false
Define the general features of bloodstain patterns. correct answers 1. direction of origination
2. Angle of impact
3. location/position of victim
4. movement of bleeding person
5. minimum number of blows
6. approx. location of suspect inflicting harm
True or False: A spurt pattern can show movement. correct answers false, show impact
What does the shape of a blood droplet say about the angle of impact? correct answers the more
of a perfect circle it is, the closer it is to a 90 degree angle. Tails become longer with decreasing
angles. Stains become more ellipitcal with decreasing angleselliptical
Why does cast-off spatter only show the minimum number of blows? correct answers because
the first blow causes bleeding so there will not be any blood on the weapon
Define each of the types of bloodstain patterns. correct answers 1. Cast off - blood on an object
gets flung off onto another object. Produces a line of blood droplets
2. Arterial spray - due to an injury to an artery or the heart. Pumped pressure causes blood spray
and the initial arterial spray will be the largest and progressively get smaller
3. Simple Transfer - The transfer of blood from one object to another; bloody object touches
clean object
4. Swipe - bloody object contacting clean object with movement
5. Wipe - blood on a surface and an object goes through it
6. Blood Flow - movement of blood due to gravity
7. Blood Pools - collection of blood on a surface
8. Drip Trail - victim/suspect moves and gravity pulls the blood down, shows travel, due to
gravity
9. Impact Spatter - an object forcefully contacts a blood source; low, medium, and high velocity
impact
What is the difference between a blood flow and a blood pool? correct answers Blood flow is the
movement of blood due to gravity and a blood pool is the collection of blood. A blood flow can
lead to a blood pool.
SOLUTIONS!!
How can you determine the direction of travel for a blood droplet that does not have an
elongated tail? correct answers the more perfect circle of a bloodstain pattern is, the closer it is to
a 90-degree angle of impact. Can also use several tails to determine direction of travel. Distorted
edges indicate travelling direction.
True or False: A medium velocity spatter would be created due to gravity. correct answers false
Define the general features of bloodstain patterns. correct answers 1. direction of origination
2. Angle of impact
3. location/position of victim
4. movement of bleeding person
5. minimum number of blows
6. approx. location of suspect inflicting harm
True or False: A spurt pattern can show movement. correct answers false, show impact
What does the shape of a blood droplet say about the angle of impact? correct answers the more
of a perfect circle it is, the closer it is to a 90 degree angle. Tails become longer with decreasing
angles. Stains become more ellipitcal with decreasing angleselliptical
Why does cast-off spatter only show the minimum number of blows? correct answers because
the first blow causes bleeding so there will not be any blood on the weapon
Define each of the types of bloodstain patterns. correct answers 1. Cast off - blood on an object
gets flung off onto another object. Produces a line of blood droplets
2. Arterial spray - due to an injury to an artery or the heart. Pumped pressure causes blood spray
and the initial arterial spray will be the largest and progressively get smaller
3. Simple Transfer - The transfer of blood from one object to another; bloody object touches
clean object
4. Swipe - bloody object contacting clean object with movement
5. Wipe - blood on a surface and an object goes through it
6. Blood Flow - movement of blood due to gravity
7. Blood Pools - collection of blood on a surface
8. Drip Trail - victim/suspect moves and gravity pulls the blood down, shows travel, due to
gravity
9. Impact Spatter - an object forcefully contacts a blood source; low, medium, and high velocity
impact
What is the difference between a blood flow and a blood pool? correct answers Blood flow is the
movement of blood due to gravity and a blood pool is the collection of blood. A blood flow can
lead to a blood pool.
