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 a Beautiful Name Asker, Ligertwood said about the audience: Finally, she said about performing the song: In July 2017, the Voices of Lee, the "elite" a cappella singing group, posted a video of the song to their Facebook page. The cover was an instant hit and reached the so-called viral threshold of 5 million views in two days. As of October 2017, it had amassed 33 million views. The group represents Lee University in Tennessee; the video was filmed in the school's chapel. What a Beautiful Name "What a Beautiful Name" is a song by Australian praise and worship group Hillsong Worship. The