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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 The circulatory system Blood vessels
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Lesson 11, Topic 2
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Blood vessels

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Arteries

  • Arteries carry blood away from the heart.

  • They carry blood under high pressure causing them to expand as the heart beats (pulse)

Veins

  • Veins carry blood towards the heart.

  • They carry blood under low pressure so they require valves to prevent back flow of blood

  • When muscles contract they squeeze the veins and help to push blood back to the heart

Arteries vs veins

Capillaries

  • Capillaries are tiny tubes that link arterioles to venules.

  • Their function is to allow exchange between blood and tissues via tissue fluid.

  • Capillaries have thin walls just one cell thick and are porous