Blood Spatter Test Review

Blood plasma is made mostly of what components?

90% water, 10% nutrients, dissolved proteins, and waste

Blood spatter larger than 4mm is common with what injury?

A blunt object impact

If a person has type A blood, who can they donate blood to? Who can they get a blood transfusion from?

A can donate to A and AB, they can receive from O and A

Circular blood drops are common with what type of injury?

A dripping wound

Type A can donate to

A, AB

Type O can donate to

A, B, AB, O

Type AB can donate to

AB

Type B can donate to

B, AB

What type of WBC is activated during an antigen-antibody response?

B-lymphocytes release antibodies to attack the foreign substance

Medium velocity blood spatter measuring 1-4mm is common with what type of injury?

Beating or Stabbing

How can blood be used as individual evidence? Explain.

Blood can be used as individual evidence because of DNA profiling and can help identify a suspect

Type A

Blood cells have A antigen proteins, 39% of population

Type B

Blood cells have B antigen proteins, 12% of population

Type AB

Blood cells have both A and B antigen proteins, 4% of population

Type O

Blood cells have neither A nor B antigen proteins, 45% of population, universal donor

Blood is made of what percent cells and what percent plasma?

Blood is made of 45% cells and 55% plasma

Where in the body is blood produced?

Blood is produced in bone Marrow

Egyptians used what technique to try to cure diseases?

Bloodletting

Blood typing is considered what kind of evidence?

Class evidence

Who was the first to research and analyze spatter patterns?

Dr. Victor Balthazard

What is the study of blood applied to crime called?

Forensic Serology

Rh+

Have an additional surface protein called the Rh factor, 85% of population

What components of RBCs carry oxygen?

Hemoglobin

Why is blood red?

It contains red blood cells which contain hemoglobin that is made of Iron

Who discovered the ABO and Rh blood groups?

Karl Landsteiner

Rh-

Lack the additional surface protein resulting in Rh-, 15% of population

Which test produces light when possible blood is present?

Luminol

Who should be most concerned with the condition Erythroblastosis fetalis?

Males with Rh positive with females with Rh negative

Looking at blood through a microscope, how can you determine if it is from a mammal?

Mammals have circular, un-nucleated red blood cells

Which type of cell is most abundant in blood? WBC, RBC, platelets?

Red Blood Cells

Which type of cell is most abundant in blood?

Red Blood cells

Erythrocyte

Red blood cells, have hemoglobin and carry oxygen and carbon dioxide

The Rh factor was discovered when studying which organism's blood?

Rhesus Monkey

When blood falls, it maintains what shape and why?

Round, it sticks together when it falls

Small secondary droplets around the main blood spatter drop are called:

Satellite Drops

A circular drop of blood indicates a blood drop fell how?

Straight down

Which test uses antibodies that react to human blood to tell if mammal blood is from a human?

The ELISA test

Which test reacts with blood stains and turns pink if blood is present?

The Kastle- Meyer Test

When there are two or more blood spatters, how can a forensic scientist determine the point of origin of blood source?

The direction of blood spatter by drawing lines of convergence

A forensic detective finds blood at a crime scene with unique blood protein M. Does this make his job easier or more difficult? Explain why or why not.

The unique protein would make it easier to identify the suspect because not everyone will have it.

Blood platelets serve what function?

They assist in clotting and repair damaged blood vessels.

Blood is considered to be a type of what? Tissue, organ, organ system, organism

Tissue

Blood is considered to be a type of...?

Tissue

Which type of blood cells fights disease as part of the immune system?

White blood cells

Leukocyte

White blood cells, immunes system cell which fight disease and produce antibodies

Antibodies

Y-shaped proteins secreted by white blood cells that attach to antigens to destroy them.

You find bloody clothing at a crime scene and you want to send it back to the lab for testing, what should you do?

You should allow it to completely Air Dry

When first arriving at a crime scene, you do not see blood. What should you do?

You should spray Luminol

During an antigen-antibody response, what binds to and destroys the foreign invaders?

antibodies

Antigen

antibody response in which white blood cells called B- lymphocytes release antibodies to attack the foreign substance

Arteries

carry blood away from the heart and divide to form capillaries

Veins

carry blood towards the heart

Blood typing is considered what kind of evidence?

class evidence

You find a red stain at a crime scene but you are not sure if it is blood. What should you do?

confirm that it is blood, The ELISA Test

Blood is red because it contains what components?

iron

Thrombocyte

platelets, small cell fragments that assist in blood clotting and repair damaged blood vessels

If blood lands on a porous surface, such as wood or ceiling tile, then the edge of the drop of blood may form extensions called...

spikes

Agglutination

the clumping of Red Blood Cells