Why would having plaques in the coronary arteries cause symptoms of syncope, angina, and dyspnea, particularly on exertion?

Frequent Symptoms Shortness of breath: If you have insufficient blood flow in the coronary vessels, you may feel that you can't catch your breath, can't get enough air, or cannot breathe. This sensation is often described as dyspnea. It is more likely to occur or worsen with physical exertion or emotional stress.

Explanation:

which of what? i am confused