"-pnea" is a suffix that refers to which physiological function?

The suffix "-pnea" specifically relates to the process of breathing. It is derived from the Greek word "pnoia," which means "breath" or "breathing." In medical terminology, you will often encounter it in terms that describe various conditions or states involving breathing, such as "apnea" (the absence of breathing), "dyspnea" (difficulty breathing), and "tachypnea" (abnormal rapid breathing). Understanding this suffix is crucial for healthcare professionals as it helps in accurately identifying and communicating various respiratory conditions. In contrast, the other options relate to different bodily functions that do not incorporate this specific suffix, which solidifies the connection of "-pnea" exclusively to breathing.