Final answer:
The portion of each lung that is in contact with the thoracic wall is the costal surface of the lung. The costal surface of the right lung is divided into three lobes and the costal surface of the left lung is divided into two lobes.
Step-by-step explanation:
The portion of each lung that is in contact with the thoracic wall is known as the costal surface of the lung. The portion of each lung that is in contact with the thoracic wall is the costal surface of the lung. The costal surface of the right lung is divided into three lobes and the costal surface of the left lung is divided into two lobes.
This surface borders the ribs and is responsible for the exchange of oxygen and carbon dioxide with the blood. The costal surface of the right lung is divided into three lobes (superior, middle, and inferior lobes) and the costal surface of the left lung is divided into two lobes (superior and inferior lobes).