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Do Now4/9/14. USURP: you find the definition. Task: Diagnosis the illness Age: 4 Sex M Location: California Medical History premature at birth , slow growth and short stature Family Medical History Two cousins are unable to digest gluten Other symptoms: Abdominal pain

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Do Now4/9/14

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Do now 4 9 14

Do Now4/9/14

USURP: you find the definition.

Task: Diagnosis the illness

  • Age: 4 Sex M

  • Location: California

  • Medical History premature at birth, slow growth and short stature

  • Family Medical History

  • Two cousins are unable to digest gluten

  • Other symptoms: Abdominal pain

  • Recent events: Ate three bowls of cereal

Forensic science

Blood Basics

Forensic Science

Expect a quiz at the end!

T. Trimpe 2006

What makes up our blood

What makes up our blood?

  • RED BLOOD CELLS (Erythrocytes) – The most abundant cells in our blood; they are produced in the bone marrow and contain a protein called hemoglobin that carries oxygen to our cells.

  • WHITE BLOOD CELLS (Leukocytes) – They are part of the immune system and destroy infectious agents called pathogens.

  • PLASMA – This is the yellowish liquid portion of blood that contains electrolytes, nutrients and vitamins, hormones, clotting factors, and proteins such as antibodies to fight infection.

  • PLATELETS (Thrombocytes) – The clotting factors that are carried in the plasma; they clot together in a process called coagulation to seal a wound and prevent a loss of blood.


Straw colored, nonliving part of blood.

90% Water

Helps to regulate body temperature

Contains Electrolytes

Plasma transports blood cells, products of digestion and hormones throughout the body.


Erythrocytes rbcs

Shaped like round plates indented in the center.

Have no nucleus

Why are they indented?

Erythrocytes (RBCs)

Why is blood red

Blood is red because it contains hemoglobin, an iron rich pigment.

Why is blood red?

What does hemoglobin do

Hemoglobin picks up the oxygen molecules and drops off CO2

What does hemoglobin do

Carbon monoxide

Binds to RBC better than oxygen.

Kills us silently

Cant smell it or taste it.

Victims of CO have an intense pink color to their skin.

Carbon Monoxide

The most common symptoms of CO poisoning are headache, dizziness, weakness, nausea, vomiting, chest pain, and confusion

Carbon monoxide1

Carbon Monoxide

  • Carbon monoxide acts in part by tying up hemoglobin. Its affinity for hemoglobin is 200 times that of oxygen.

  • Smokers are likely to have 10% saturation of hemoglobin. Saturation from 20-30% will make you sick (it's at this point that cherry-red lividity may appear).

  • Saturation of 60% or more will probably kill you (less if you've got angina, emphysema, etc.)

Leukocytes white blood cells

Fight infections

Large in size

Have a nucleus


Leukocytes (White Blood Cells)

Thrombocytes platelets

Smallest part of blood

No nucleus

Live 2-4 days

Involved in clotting of blood

Thrombocytes (Platelets)

Bone marrow

Makes the cells of the blood

Bone marrow

Do now 4 9 14

Bone marrow is located inside certain long bones.

Blood facts

Blood Facts

The average adult has about FIVE liters of blood inside of their body, which makes up 7-8% of their body weight.

Blood is living tissue that carries oxygen and nutrients to all parts of the body, and carries carbon dioxide and other waste products back to the lungs, kidneys and liver for disposal. It also fights against infection and helps heal wounds, so we can stay healthy.

There are about one billion red blood cells in two to three drops of blood. For every 600 red blood cells, there are about 40 platelets and one white cell.

Genetics of blood types

Genetics of Blood Types

  • Your blood type is established before you are BORN, by specific GENES inherited from your parents.

  • You inherit one gene from your MOTHER and one from your FATHER.

  • These genes determine your blood type by causing proteins called AGGLUTINOGENS to exist on the surface of all of your red blood cells.

What are blood types

Blood Types

AA or AO = Type ABB or BO = Type BOO = Type OAB = Type AB

There are 3 alleles or genes for blood type: A, B, & O. Since we have 2 genes, there are 6 possible combinations.

What are blood types?

Do now 4 9 14

How common is your blood type?





Do now 4 9 14

Blood Transfusions





A blood transfusion is a procedure in which blood is given to a patient through an intravenous (IV) line in one of the blood vessels. Blood transfusions are done to replace blood lost during surgery or a serious injury. A transfusion also may be done if a person’s body can't make blood properly because of an illness.

Who can give you blood?

People with TYPE O blood are called Universal Donors, because they can give blood to any blood type.

People with TYPE AB blood are called Universal Recipients, because they can receive any blood type.

Rh +  Can receive + or -

Rh -  Can only receive -

Universal Donor

Universal Recipient

Rh factors

Rh Factors

  • Scientists sometimes study Rhesusmonkeys to learn more about the human anatomy because there are certain similarities between the two species. While studying Rhesus monkeys, a certain blood protein was discovered. This protein is also present in the blood of some people. Other people, however, do not have the protein.

  • The presence of the protein, or lack of it, is referred to as the Rh (for Rhesus) factor.

  • If your blood does contain the protein, your blood is said to be Rh positive (Rh+). If your blood does not contain the protein, your blood is said to be Rh negative (Rh-).

A+ A-B+ B-AB+ AB-O+ O-

Blood evidence

Blood Evidence

  • Blood samples – Can be analyzed to determine blood type and DNA, which can be matched to possible suspects.

  • Blood droplets – Can be analyzed to give clues to the location of a crime, movement of a victim, and type of weapon.

  • Blood spatter – Can be analyzed to determine patterns that give investigators clues to how a crime mighthave happened.

Microscopic views

Fish Blood

Bird Blood

Horse Blood

Cat Blood

Frog Blood

Human Blood

Snake Blood

Dog Blood


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