Trachea act as a resonator to amplify sound. In some birds, the tracheal rings are complete, and may even be ossified. In amphibians, the trachea is normally extremely short, and leads directly into the lungs, without clear primary bronchi. A longer trachea is, however, found in some long-necked salamanders, and in caecilians. While there are irregular cartilagenous nodules on the amphibian trachea, these do not form the rings found in amniotes. The only vertebrates to have lungs, but no trachea, are the lungfish and the "Polypterus", in which the lungs arise directly from the pharynx. The word "trachea" is used to
History of beliefs about the human body muscular and focuses on the exterior of the body, what can be see and felt. This was the standard of beauty of humans and continues to be the ideal body of European traditions. There is no Vitruvian women. Eastern ideologies of the body explain what can be detected, not only felt and examined. This comes from the idea that there is not only what can be physically seen and touched but what can't be. Energy or more aptly the means by which your body can manifest itself in the world can't be seen but, was thought to be able to