Platelets & ABO System

Platelets & ABO System

• Platelets- specialized cell fragment in the blood.
• Platelets look like small specs of purple disoriented dots surrounding the lymphocyte.
• In circulating blood, platelets are small, nearly colorless bodies that usually appear as irregular spindles or oval disks about 2 to 4 micro meters in diameter.

• As soon as blood is removed from a vessel, platelets adhere to each other and assume various shapes as well as irregular forms.
• Average adult amounts 250,000 per mm cubed of blood.
• Normal amounts is between 150,000 to 400,000 per mm cubed of blood.
• There are NO differences between the sexes in platelet count.

• Platelets play an important role in both hemostasis and blood clotting (coagulation).
• Hemostasis- the stoppage of blood flow and may occur as an end result of any one of several body defense mechanisms.
• Blood Clotting- to plug ruptured vessels to stop bleeding and prevent loss of a vital body fluid.
• Platelet plug- helps to stop the flow of blood into the tissues.

• The formation of a temporary platelet plug is an important step in hemostasis which results when platelets undergo a change caused by an encounter with a damaged capillary wall, or with underlying connective tissue fibers.
• The transformation results in the creation of sticky platelets which bind to underlying tissues and each other.
• Platelets plugs are extremely important in controlling so called "Microhemorrahages," which may involve a break in a single capillary.

• Platelets are formed in the red bone marrow, lungs, and, to some extent, in the spleen by fragmentation of very large (40 to 100 Micrometers) cells known as Megakaryocytes.
• Platelets have a short life span, an average of about 7 days.

Functions of Platelets

Formation and Life Span of Platelets

Platelets

There are three types of ABO blood groups.

The ABO System

9. Platelets are formed in...?

Platelets are full of color?

Platelets Play an important role in...

The Average adult amounts how much blood?

Platelet plugs helps to stop the flow of blood into the tissues.

There ARE differences between the sexes in platelets count.

Platelets have a short life span, an average of about how many days?

Specialized fragments in the blood are?

The formation of a temporary ________ is an important step in hemostasis which results when platelets undergo a change caused by an encounter with a damaged capillary wall, or with underlying connective tissue fiber

A) Blood Clotting and Hemostasis

B) Passing Ms. Toriz's class

C) Cougualtion and Rh-Negative blood

D) A and B

A) True

B) False

A)True

B)False

There are 4 ABO blood groups.

1. Type A - Antigen A on RBCs

2. Type B - Antigen B on RBCs

3. Type AB - Both antigen A and antigen B on RBCs

4. Type O - Neither antigen A nor antigen B on RBCs

A)1mm

B) 140,000 mm

C) 250,000 mm

D) 250 mm

A)3

B) 4

C) 21

D) 7

A) True

B) False

A) Hemostasis

B) Platelets

C)Megakaryocytes

D)Antigens

A) Blood Vessel

B) White Blood Cells

C) Hemoglobin

D) Platelet Plug

A)Red bone marrow

B)Lungs

C)In the spleen (in some cases)

D)All of the above

A) True

B) False

........C)Maybe?

By: Rudy Saldivar

• Christioan Mammath
• Sandra Flores

Platelets

Functions of Platelets