Which structure is NOT part of the cardiac anatomy?

The correct choice is that the left lung is not a part of cardiac anatomy. Cardiac anatomy specifically refers to the structures that comprise the heart and its associated components. This includes various chambers of the heart, such as the right ventricle, left atrium, and also the coronary arteries that supply blood to the heart muscle itself.

The right ventricle is responsible for pumping oxygen-poor blood to the lungs, while the left atrium receives oxygen-rich blood from the lungs. The coronary arteries are vital for delivering oxygen and nutrients to the heart tissue.

In contrast, the left lung is part of the respiratory system, not the cardiovascular system, and it does not have a direct role in the heart's structure or function. Thus, it correctly stands out as the option that is not included in cardiac anatomy.