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Blood & Blood spatter Check-in (10/24/2024)

Last updated 8 months ago
30 questions
Section 1!!
1
A __________ is example of an injury that would likely cause high-velocity blood spatter.
1
A __________ bloodstain pattern is a lateral transfer of wet blood caused by bloody hair being dragged across the floor.
2

Categorize the bloodstains into their approximate angle of impact categories.

1
__________ evidence is collected in clean, unused plastic sealed containers at the crime scene.
1
Confirmation of __________ is performed by conducting a precipitin test.
1

Which direction was the blood traveling in the following photo?

1
Blood molecules are attracted to each other and tend to stick together as they fall. This is known as __________.
3

Identify and match the forces affecting blood spatter to their proper descriptions.

Draggable itemCorresponding Item
cohesion
the attraction between molecules of like substances; gives blood a domed shape when resting on a surface
adhesion
the attraction between molecules of unlike substances; causes blood to cling to porous surfaces
gravity
the force of attraction between the earth and another object; gives falling liquids a tear-dropped shape
1

Below is an illustration of white and red blood cells. Select the type of cell(s) that can provide individual evidence.

1

Calculate the percentage of the American population that has A+ blood type:
_______ % (round to 1 decimal place)
3
Identify the various bloodstain patterns shown in the photograph.
Other Answer Choices:
passive drops
void
pattern transfer
1
To prevent agglutination, blood must be tested for the presence of __________.
1

Satellites occur when a droplet of blood strikes a surface, _____.

1

Blood consists of two components of circulating connective tissue, red blood cells and white blood cells, suspended in plasma.

1

Storage of liquid blood in plastic must be less than two hours to prevent contamination.

1
Hemoglobin is found in __________.
1
A drop of blood that falls at a 90-degree angle from a wound is a(n) __________.
1
Calculate the height of the area of origin in the following diagram. Show your work and round to 2 decimal places.
height = _______ feet
4

Place the items in the proper evidence collection procedure categories.

  • wet bloodstain on a pillowcase
  • why would you package any blood evidence in a plastic bag. that's indecent
    (drag this item to the plastic bag category)
  • dried blood on a sock
  • liquid blood evidence
  • sealed plastic container
  • paper bag
  • plastic bag
2
Calculate the missing values in the data table.

Round all answers to 1 decimal place.
angle of impact = _______°
height of area of origin = _______ feet
5

Match the blood spatter/nonspatter photos to their correct names.

Draggable itemCorresponding Item
cast-off
saturation
void
drip trail
swipe
1
CSIs performed an antibody test on liquid blood recovered from a crime scene. The results are shown below:

3 suspects were taken in for questioning and each provided a sample of blood. The results are shown in the table below:


Suspect A has __________ blood type.
Suspect B has __________ blood type.
Suspect C has __________ blood type.

Should the police continue investigating any of these suspects as potential owners of the crime scene blood? __________
3
Round all calculated answers to 1 decimal place.

1cm = 10mm

width of blood droplet 2: _______ mm (answer should be a whole number)
length of blood droplet 2: _______ mm (answer should be a whole number)
Calculate the impact angle of blood droplet 2._______° (1 decimal place)

distance from edge of blood droplet 2 to center of area of convergence: _______ mm (answer should be a whole number)
Using the scale 1mm = .2 feet, convert the above distance to feet: _______ feet (1 decimal place)

Use your answer from the previous question to calculate the height of the area of origin. Round to 1 decimal place: _______ feet
1

Mr. Ly cut his finger while cutting a guava this morning. In order to ascertain whether or not this is human blood scientists must use a(n)

3

Match the pictures to the blood test best associated with it.

Draggable itemCorresponding Item
Kastle-Meyer reagent
Luminol test
precipitin test
3

Which of the following can be used to estimate the area of origin? (Select 3)

1

Select 3 drops that struck the surface closest to 90°.

1

Order the following droplets from lowest impact angle (0° is lowest) to highest.

  1. C
  2. A
  3. B
Scenario
1

Use the results of each test to determine whether the blood on each suspect’s bumper is of human origin.

Select the following gel diffusion diagram(s) that show a positive reaction for human blood.

2
Using the following blood-typing results, indicate the apparent blood type recovered from Vehicles B and C. Determine whether the blood from the car of each suspect is consistent with the victim’s blood type of AB negative.


Vehicle B:
Blood type? __________
Consistent with victim's blood type?__________

Vehicle C:
Blood type? __________
Consistent with victim's blood type?__________