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Leaving certificate biology
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Unit 1Ecology theory5 Topics|1 Quiz
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Nutrient recycling4 Topics|1 Quiz
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Ecological relationships and population dynamics2 Topics
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Human impact on the ecosystem2 Topics
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Study of a grassland ecosystem3 Topics
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Responses in the Flowering Plant4 Topics|1 Quiz
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Unit 3Sexual reproduction in the flowering plant1 Topic
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The human reproductive system3 Topics
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The menstrual cycle2 Topics
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Pregnancy2 Topics
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The circulatory system4 Topics
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Blood5 Topics
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The heart5 Topics
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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-