. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 70 ORGANIZATION AND DEVELOPMENT OF ANIMALS IN GENERAL. walls, traversed by numerous septa and folds which bear an extremely rich network of capillaries. The air tubes or trachece (fig. 65) consti- tute a branched system of canals which extend throughout the whole body, and carry the air to all the organs. Thus instead of the respi- ratory pro- cess being localised, as it is in ani- mals with lungs, it is carried on in all tissues and organs of the body, which are surrounded by a fine ^ trac
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 70 ORGANIZATION AND DEVELOPMENT OF ANIMALS IN GENERAL. walls, traversed by numerous septa and folds which bear an extremely rich network of capillaries. The air tubes or trachece (fig. 65) consti- tute a branched system of canals which extend throughout the whole body, and carry the air to all the organs. Thus instead of the respi- ratory pro- cess being localised, as it is in ani- mals with lungs, it is carried on in all tissues and organs of the body, which are surrounded by a fine ^ trachea! network. Nevertheless, the air tubes in the case of the modification known as fan- trachece present an approximation in their structures to lungs, in that the main stems, without further branching, give rise to flat hollow i iia Fio. 65.—Tracheae with fine brauches (after Leydig). Z, cellular outer wall; Sp, spiral Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. London, Swan Sonnenschein & co.
Size: 1413px × 1768px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, bookcollectionbiodiversity, bookdecade1890
