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Flashcards in Blood Typing Deck (13)
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1

In violent crimes, blood is often left on the crime scene or clothes. How does this help the investigation?

The blood can help to form evidence against the suspect or victim.

2

What is blood analysis?

Blood analysis is used to help confirm the presence or a suspect at the crime scene. It can be used to find an unknown victim.

3

What is found in blood?

Blood is used to transport materials around the body and to help prevent disease. You have about 5 litres of blood in your body.

4

What are the main components of blood?

 

  • RED blood cells-to carry OXYGEN
  • WHITE  blood cells-to fight DISEASE
  • PLASMA-to carry BLOOD CELLS, digested FOOD, WASTE (eg, carbon dioxide), HORMONES and ANTIBODIES.
  • PLATELETS-fragments of cells to HELP the BLOOD to CLOT.

 

5

Are there more RED or WHITE blood cells in your BLOOD?

There are MANY more RED blood cells to white.
The ratio is about 600-700:1

6

Red blood cells are;

  • small
  • disclike shape that have no nucleus. This increses their surface area for carrying Oxyggen.
  • contain haemoglobin (red pigment), that binds to OXYGEN

7

White blood cells are;

  • large
  • have a nucleus

8

Some white blood cells;

  • Change shape so they can destroy microrganisms.
  • Produce antibodies

9

Plasma:

  • A straw-coloured liquid
  • Mainly water (90%)

10

What is a  blood group?

The type of blood you have is determined by your genes. The 4 blood types are;

A

B

AB

O

11

Blood types are determined by antigens. (protein mlecules) found on the surface of red blood cells.

What are the four antigens in each of the blood types?

  • A    - Contains A antigens
  • B    - Contains B antigens
  • AB - Contains A and B antigens
  • O    - Contains no antigens

12

What are the rough preportions of the different blood types in the UK?

  • 44% O
  • 42% A
  • 10% B
  • 4% AB

13

Why is it important to know your blood  type if you are having a transfusion?

If you get the wrong type of blood your immune system will identify the antigens as being foreign and will produce antibodies to destroy them.