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
More Hits by The Supremes More Hits by The Supremes More Hits by The Supremes is the sixth studio album by Motown singing group The Supremes, released in 1965. The album includes two number-one hits: "Stop! In the Name of Love" and "Back in My Arms Again", as well as the Top 20 single "Nothing but Heartaches". The album opens up with the b-side "Ask Any Girl" from their "Where Did Our Love Go" album, which ironically ended side 2 of their previous album of new material. It was once planned for single release with this new mix. Barney Ales, then an executive vice-president of