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
This Is What You Want... This Is What You Get He then flew over to London and presented them to Richard Branson as the finished new PiL album for Virgin Records: "Commercial Zone". For his part, John Lydon decided to completely abandon the tapes and re-record the whole album from scratch with session musicians. This new version of "Commercial Zone" became "This Is What You Want... This Is What You Get" in 1984. "The Order of Death" is a reference to the film "Copkiller", also known as "The Order of Death". The line "This is what you want... This is what you get", which gives title to the album, appears