Trachea Diffusion of oxygen and carbon dioxide takes place across the walls of the smallest tubes, called tracheoles, which penetrate tissues and even indent individual cells. Gas may be conducted through the respiratory system by means of active ventilation or passive diffusion. Unlike vertebrates, insects do not generally carry oxygen in their haemolymph. This is one of the factors that may limit their size. A tracheal tube may contain ridge-like circumferential rings of taenidia in various geometries such as loops or helices. Taenidia provide strength and flexibility to the trachea. In the head, thorax, or abdomen, tracheae may also be connected
My Name Is 'A' by Anonymous to releasing the film Ryan chose to release the work anonymously due to negative initial critic reviews. At this point the film's title had changed to "My Name Is 'A'" and Ryan added the words "By Anonymous" to the title to reflect on what was supposed to be the anonymity of the director. He later decided against releasing the film anonymously, but chose to leave "By Anonymous" in the title to reflect on the anonymity of several of the characters in the film. Theatrical and VOD film rights to "My Name Is 'A' By Anonymous" were purchased shortly after its