What does the term "apices" refer to?

The term "apices" is the plural form of "apex," which generally refers to the tip or summit of a structure. In medical contexts, it is commonly used to describe the uppermost portions of organs, such as the "apices of the lungs." The lung apices are located at the top of each lung, extending into the thoracic cavity above the level of the first rib. This definition aligns perfectly with the choice that specifically mentions "more than one apex," highlighting that there are apices corresponding to each lung.

Understanding this term is crucial in various medical scenarios, including imaging studies and examinations, where it is essential to identify the anatomical locations correctly. The other terms provided in the options do not define "apices" and instead refer to specific conditions or structures related to pulmonary health, such as heart anatomy, fluid accumulation, or infections, which are separate concepts entirely.