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
Uma (given name) rice fields. Uma in Japanese means horse. Uma in Swahili means bite. Uma (given name) Uma is a given name in various cultures. In India, it is the name of the Hindu goddess, who is more commonly known as Parvati. In Sanskrit the word "" can further mean "tranquillity", "splendour", "fame" and "night". In Hebrew and Aramaic its meaning is "nation". It is also used by the Tiv people of Cameroon and Nigeria where the meaning in the Tiv language is "life". The name Uma is also popular in the Otukpo subgroup of the Idoma people of Nigeria and the