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
My Name Is Red the specific manuscripts described (most prominently the "Shahnama given by Shah Tahmasp", more commonly known in the west as the Houghton shahnama) are real and survive in whole or part. "My Name Is Red" received favourable reviews when published in English. A reviewer for "Publishers Weekly" admires the novel's "...jeweled prose and alluring digressions, nesting stories within stories" and concludes that Pamuk will gain many new readers with this "...accessible, charming and intellectually satisfying, narrative." A "Kirkus Reviews" critic describes the novel as "...a whimsical but provocative exploration of the nature of art in an Islamic society. . . .