respiratory system

This term is a technical medical designation used across clinical, biological, and educational registers. It describes the integrated network of organs rather than a single organ, encompassing everything from the nasal cavity to the alveoli of the lungs. In a medical context, it is often used to categorize diseases or malfunctions, such as respiratory failure or respiratory distress.

Because it refers to a specific biological system within an organism, it is treated as a singular entity. While one can discuss the respiratory systems of different species in a comparative biological study, in a clinical setting regarding a single patient, it is almost exclusively used in the singular.