Which term describes the act of breathing normally and without effort?

• A. Afebril
• B. Pyrexia
• C. Eupnea
• D. Ventilation

Answer: (C)

Eupnea describes normal, effortless breathing at rest. It means a regular rate and depth of breaths without distress or labored effort. Afebrile and pyrexia relate to fever status (without fever vs fever) and don’t describe how we breathe. Ventilation refers to the mechanical movement of air in and out of the lungs, which is a broader process and not specifically the pattern of normal, easy breathing. Since the question focuses on how breathing normally feels and appears at rest, eupnea is the term that best fits.