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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
Lesson 13, Topic 3
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A healthy circulatory system

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The pulse

  • Wave of vibrations passing down wall of artery caused by the expansion of the artery

What does blood pressure measure?

  • Amount of pressure required to stop flow of blood in the artery

  • Force of the blood against the wall of the artery

High blood pressure:

  • this indicates that the heart has to pump harder to get sufficient blood around the body. In time this may lead to heart attacks

From what part of the body is blood pressure usually measured?

  • Artery of upper arm

Factors that effect heart rate

  • Exercise

  • Fear

  • Drugs

  • Sleep

The effects of smoking on the heart

  • High blood pressure

  • Greater risk of heart attack and stroke

The effects of diet on the heart

  • A fat rich diet increases the chance of arteries becoming blocked, leading to heart attacks

  • Too much salt raisesĀ  blood pressureĀ 

  • Being overweight increases blood pressure and results in heart attacks

The effect of exercise on coronary heart disease

  • Heart becomes stronger and more efficient

  • Improves supply of oxygen to cardiac blood vessels

  • Rate of beating lowered