left lung has a cardiac notch.
Left
so that we can differentiate the right lung and left lung. the lung with the cardiac notch is the left lung as the heart is on the left side of the body.
Only the left lung has these features.
to accommodate the heart
LEFT
the left lung is narrower than the right lung because of the amount of space the mediastinum (which includes the heart, blood vessels and others) on the left side. the left lung includes a cardiac notch where the heart lies.
A deep notch in the alimentary canal at the junction of the esophagus and the stomach.
The left is smaller, due to the presence of cardiac notch
Human lungs aren't the same shape on opposite sides of the body because the heart sits slightly to the left of the midline. To make room for the heart in humans, the left lung has a cardiac notch, which isn't found on the right lung.
The left lung has a notch at its inferior medial end because the heart rests against that area.
aortic valve closure
A deep notch in the alimentary canal at the junction of the esophagus and the stomach.
The left lung is slightly smaller than the right lung because 2/3 of the heart is located there. The left lung contains the cardiac notch, an indentation in the lung that surrounds the apex (pointed end) of the heart. The smaller left lung only has 2 lobes, the superior and inferior.