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
What Is Life the Harrison YouTube channel and other media platforms. A live version of the song, recorded with Eric Clapton and his band in December 1991, is available on Harrison's 1992 album "Live in Japan" album. The performance was recorded at Tokyo Dome on 17 December, during the final show of the tour. Part of a concert performance of "What Is Life" from Harrison's 1974 North American tour with Shankar is included in Scorsese's "George Harrison: Living in the Material World". While challenging the commonly held view that this controversial 1974 tour was a "disaster", Simon Leng writes of a Fort Worth