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
The Body in the Library earlier, Anne Meredith knows Ariadne Oliver as the writer of a book called "The Body in the Library". In the first episode of the second series ("And the Moonbeams Kiss the Sea") of the television series "Lewis," the body of a handyman is found in the Bodleian Library. DS James Hathaway comments to DI Robbie Lewis, "You realise what we've got, don't you, sir. ... The body in the library." The 1984 television film "The Body in the Library" was part of the BBC series of "Miss Marple", with Joan Hickson making the first of her acclaimed appearances in the