This video explains how blockage can occur inside blood vessels, and what the repercussions are. As the cardiovascular system is revealed, Dr. Peter Fail, a cardiologist, shows an angiogram revealing blockage in the artery. If a blockage occurs in the arteries supplying the heart with the brain, the results are heart attack or stroke. This may also lead to increased blood pressure. The cardiologist, Dr. Karol Watson, further explains that this increase in blood pressure can damage every organ it hits. Dr. Mehmet Oz, a heart surgeon, notes that a high percentage of Americans die as a result of heart disease.