Formative Practice 10.6 (Form 4 Biology Textbook Exercise and Answer)

Question 1:
What is the meaning of myocardial infarction?

Heart attack

Question 2:
Explain how stroke happens.

Stroke occurs when a blood clot impedes blood flow to the brain.

Question 3:
In your opinion, what are the factors that contribute to an individual’s risk of getting cardiovascular disease?

A diet rich in lipids and low in fibre, lack of exercise, obesity and smoking.

Question 4:
Explain how atherosclerosis happens.

• Plaque is formed and deposited on the arterial walls.

• Plaque consists of cholesterol, lipids, fibrous connective tissues, dead muscle tissues and clumped platelets.

• The plaque clogs and narrows the blood vessel’s lumen.

• Atherosclerosis is the early stage of arteriosclerosis.

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