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Leaving certificate biology

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  1. Ecology theory
    5 Topics
    |
    1 Quiz
  2. Unit 1
    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
Lesson 12, Topic 5
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The blood past paper questions

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Some typical human red blood cells are shown below. They are disc shaped

What word is used to describe the shape of the two faces of these cells ?

Biconcave

Answer

Red blood cells are wider than some capillaries. What feature of red blood cells allows them to pass through the narrow capillaries?

They are flexible

Answer

Name the molecule in red blood cells that carries oxygen

Heamoglobin

Answer

Human red blood cells live for about 120 days. Give a reason for this, based on the composition of these cells

  • No nucleus

  • No mitochondria

  • No organelles

  • Cannot reproduce

Answer

Where are red blood cells 1. produced  and 2. usually broken down?

Produced: Bone marrow

Broken down : Liver

Answer

Red blood cells are transported in the blood plasma. Name the transport fluid in humans that does not contain red blood cells

Lymph

Answer

Blood acts as a transport medium in the human body. Name two substances, other than food molecules and water, that are transported in the blood.

  • Urea

  • Hormones

  • Antibodies

  • Oxygen

  • Carbon dioxide

  • Plasma proteins

Answer

In terms of structure, state any two differences between the human blood and lymph systems

Blood system:

  • Closed system

  • Double circulatory system

Lymph system:

  • Open system

  • Single circulatory system

 

Answer

State two ways in which the structure of a red blood cell differs from that of other human cells

  • No nucleus

  • No mitochondria

Answer

Human blood is classified into 4 different groups, A, B, AB, O. What other system is used to further classify blood

Rhesus

Answer