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Leaving certificate biology

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  1. Unit 1
    Ecology theory
    5 Topics
    |
    1 Quiz
  2. Nutrient recycling
    4 Topics
    |
    1 Quiz
  3. Ecological relationships and population dynamics
    2 Topics
  4. Human impact on the ecosystem
    2 Topics
  5. Study of a grassland ecosystem
    3 Topics
  6. Responses in the Flowering Plant
    4 Topics
    |
    1 Quiz
  7. Unit 3
    Sexual reproduction in the flowering plant
    1 Topic
  8. The human reproductive system
    3 Topics
  9. The menstrual cycle
    2 Topics
  10. Pregnancy
    2 Topics
  11. The circulatory system
    4 Topics
  12. Blood
    5 Topics
  13. The heart
    5 Topics
Leaving certificate biology Blood Blood groups
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Lesson 12, Topic 2
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Blood groups

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Blood groups

  • Your blood group depends on the presence or absence of different glycoprotein (carbohydrate and protein) molecules on the surface of your red blood cells that acts as antigens
  • There are 3 possible antigens:  A, B and factor D
  • There are 4 possible blood groups: A, B, AB and O

Describing the four blood groups in terms of their antigens

Blood groups in order of how common they are in the population

O (most common)

A

B

AB (least common)

The importance in providing a transfusion that matches the blood type of the patient

  • If the blood does not match correctly then the blood may clump

The rhesus system for blood grouping?

  • If blood includes and antigen called factor D they are said to be Rhesus positive (Rh+)
  • Those who do not posses the factor are Rhesus negative (Rh-)
  • A persons blood group will either be A, B, AB, O and either + or –
  • Most Irish people are O-