1.

Explain  the passages with reference to the context :When an artery …………… plugged artery. 

Answer»

Context : Whenever there is any heart trouble, heart sends out its signal. It indicates that it is not getting enough nourishment. The heart does not get its nourishment from the blood passing through its four chambers. But it gets its nourishment by its own coronary arteries. 

Explanation : In this passage the heart says how heart attack happens. Sometimes either fat is deposited or a clot is formed in the coronary arteries. It blocks the artery. So, a portion of heart muscle which is fed by it dies and leaves a scar tissue. Thus, the supply through coronary arteries is interrupted and it causes heart trouble. Seriousness of the trouble depends upon the size and position of plugged artery.



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