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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 Lymph
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Lesson 12, Topic 3
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Lymph

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Lymph

  • Colorless fluid

  • Formed from tissue fluid (leaked plasma)

  • Consists of plasma and lymphocytes 

  • Contains no red blood cells

The lymphatic system

  • A one way system that consists of lymph vessels and lymph nodes (glands)

  • Vessels have valves to prevent the back flow of lymph

Functions of the lymphatic system

Transport:

  • It collects tissue fluid and returns it to blood

  • Lacteals in the villi absorb lipids which are transported to the blood

Defense against disease:

  • Nodes filter plasma, removing pathogens

  • Nodes produce lymphocytes  (B and T cells)