EVERYDAY SCIENCE

Detailed explanation-1: -The human left lung is divided into two lobes, an upper and a lower, by the oblique fissure. It has a cardiac notch, a concave impression molded to accommodate the shape of the heart. The lingula is not technically a lobe, but is the left lung equivalent of the right lung’s middle lobe.

Detailed explanation-2: -The left lung is slightly smaller and has a notch to give room for the heart. Each lung is divided into lobes-the left lung has two and the right lung has three-which are similar to balloons filled with sponge-like tissue.

Detailed explanation-3: -The anterior border of the lung corresponds to the pleural reflection, and it creates a cardiac notch in the left lung. The cardiac notch is a concavity in the lung that formes to accommodate the heart.

Detailed explanation-4: -The right and left lung anatomy are similar but asymmetrical. The right lung consists of three lobes: the right upper lobe (RUL), the right middle lobe (RML), and the right lower lobe (RLL). The left lung consists of two lobes: the left upper lobe (LUL) and the left lower lobe (LLL).

Detailed explanation-5: -Answer and Explanation: The right lung has three lobes because it is slightly larger than the left lung. The left lung is smaller because it must share space on the left part of the chest with part of the heart. Therefore, since the right lung is a little bit wider, it is divided into three lobes instead of only two.