a group of physiologically or anatomically related organs or parts

the entire physical structure of an organism (an animal, plant, or human being)

the passages through which air enters and leaves the body

any organ involved in the process of respiration

one of the tubules forming the respiratory system of most insects and many arachnids

One of the external filaments or leaflike plates connected with the tracheae of the inside of the body that form part of the respiratory system of some aquatic insect larvae and nymphs but rarely persist in the adult.

The invertebrate trachea refers to the open respiratory system composed of spiracles, tracheae, and tracheoles that terrestrial arthropods have to transport metabolic gases to and from tissues.

the entire physical structure of an organism (an animal, plant, or human being)

the passages through which air enters and leaves the body

any organ involved in the process of respiration

one of the tubules forming the respiratory system of most insects and many arachnids