Which two of the following statements regarding respiratory structures are true?

The statement about the portion of the lung superior to the clavicle being called the apex is accurate. The apex of the lung refers to the topmost part that extends above the level of the first rib and is positioned just beneath the clavicle. This anatomical feature is important as it signifies the highest point of the lung structure, contributing to the overall understanding of lung anatomy in relation to thoracic structures.

In addition, each lung indeed has a unique structure. The right lung is actually made up of three lobes—superior, middle, and inferior—while the left lung has just two lobes—superior and inferior—accommodating space for the heart.

Moreover, each lung does possess visceral pleura, which is a protective membrane surrounding the lungs, ensuring they remain moist and helping facilitate movement during respiration. The statement regarding the small air sacs being referred to as terminal bronchioles is inaccurate because these structures are called alveoli, where gas exchange occurs.

Understanding these key terms and structures is essential for comprehending the respiratory system's function and anatomy in the context of medical radiology.