Respiratory System in Vertebrates (With Diagram) | Chordata | Zoology

In vertebrates the skin may be respiratory (e.g., anurans), while in some fishes and aquatic turtles, the vascular rectum or cloaca is respiratory. But there are two main types of respiratory organs- gills for aquatic respiration and lungs for aerial respiration. Both gills and lungs may occur in the same animal. Accessory respiratory organs are also present in some vertebrates. [...]