1. Identify the aorta and pulmonary trunk.
 
 
2. What vessels passes behind the pulmonary trunk?
 
 
3. What normal and pathological findings are present in coronary artery that is being assessed?
 
 
4. Why is a large blockage of the left mainstem coronary more significant than a blockage of either the left anterior descending or left circumflex coronary artery?
 
 
5. Why is the coronary artery difficult to cut through?