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Biology coronary heart_disease
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Biology coronary heart_disease

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  • 1. Biology E-Learning Sec 3 Express Chapter 8 Transport in Human Sub-topic: Coronary heart disease
  • 2. Coronary Heart Disease Task 1 Stent Implant Task 2 Atherosclerosis
  • 3. Part 1 Information on Coronary Heart Disease
  • 4.
    • coronary arteries : carry blood to heart muscles
    • blockage of the coronary arteries reduce blood flow to heart muscles & caused 2 problems :
    • Angina (chest pain) &
    • Heart attack
    • blockage usually caused by fat deposits in coronary arteries
    Coronary Heart Disease Right coronary artery Left coronary artery
  • 5.
    • reduction or complete blockage of blood flow to heart muscles results in insufficient food & oxygen delivered to muscles. That region of the heart muscles dies .
    • Therefore muscles are unable to function (contract & relax) efficiently to pump blood to all parts of body especially during physical activities, which can be fatal.
    Coronary Heart Disease
  • 6. Coronary Heart Disease http://netnewsdaily.com/wp-content/uploads/2009/04/heart_attack2_full.jpg
  • 7. What causes coronary heart disease? Atherosclerosis
    • the deposition of fatty substances (cholesterol & polysaturated fats) on inner wall of coronary arteries
    • lumen of arteries become narrow & blood pressure increases
    Coronary Heart Disease
    • a rough inner surfaces develops & increases the risk of a blood clot being trapped in the artery
    thrombosis – a condition where a blood clot forms in the artery
  • 8.
    • Causes of coronary heart disease:
    • Diet rich in saturated animal fats & cholesterol
    • Stress (causes constriction of blood vessels)
    • Smoking
    • Lack of exercise
    Result: Block arteries & reduce or cut off blood flow completely to the heart muscles, cause angina & heart attack if blockage occur in coronary arteries . Lack of oxygen to heart muscles caused the muscles to die. Why? Coronary Heart Disease
  • 9. Treatment: Drugs to dilate arteries Stent (‘Balloon’) – page 166 TIDBIT Heart by-pass (surgery)
    • Preventive measures against coronary heart disease:
    • proper diet, low in saturated fats, rich in dietary fibres
    • stress management
    • avoid / quit smoking
    • read up about effects of nicotine & carbon monoxide
    • regular exercise (strengthens heart)
    Coronary Heart Disease
  • 10. Video clip on Coronary Heart Disease http:// www.youtube.com/watch?v = SjRPxGNOtjM
  • 11. Task 1
    • Outline the link between coronary heart disease and diet .
    • 2. Explain how an unhealthy diet can lead to coronary heart disease
    Type your answer in word document, indicating your name & class clearly. Submit your assignment online through Moodle.
  • 12. Part 2 Stent implant
  • 13. Stents procedure http://www.nhlbi.nih.gov/health/dci/Diseases/stents/stents_all.html This lesson package is designed and prepared by Ms Tang
  • 14. Additional reading for students who want more information on atherosclerosis: http://www.merck.com/mmhe/au/sec03/ch032/ch032a.html Part 3
  • 15. Part 3 Coronary heart disease is one of the first ‘killers’ in the world. Stent implant is a common procedure performed by doctors to treat patients whose heart arteries have been clogged with deposits of cholesterol. The stent serves to keep open blocked arteries so that adequate blood flow can be restored to the heart. If blood flow through the arteries is reduced, the heart muscle may not receive enough oxygen, and chest pain (angina) or breathlessness result. A heart attack occurs when an artery becomes completely blocked. Task 2 You are required to give your comments on the advantages and disadvantages of a stent implant in the forum .