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
Papal name used by one or more legitimate popes (e.g. Benedict X was later reckoned as antipope). Immediately after a new pope is elected, and accepts the election, he is asked in Latin "By what name shall you be called?"† The new pope chooses the name by which he will be known from that point on. The senior Cardinal Deacon, or Cardinal Protodeacon, then appears on the balcony of Saint Peter's to proclaim the new pope by his birth name, and announce his papal name: <poem> Annuntio vobis gaudium magnum: Habemus Papam! Eminentissimum ac reverendissimum dominum, dominum [baptismal name], Sanctæ Romanæ Ecclesiæ