Heart attack is also called . . . . . . .

What is the full form of $CAD$?

In which disease does acute chest pain appear when not enough oxygen is reaching the heart muscle?

Complete stoppage of heart beat is known as

The state of the heart when it is not pumping blood effectively enough to meet the needs of the body is known as:

Give scientific reasons:
$(1)$ Plaque stimulates/causes the formation of a blood clot on the wall of an artery.
$(2)$ Blood pressure and smoking have a direct relation with obesity.