A gross and microscopic study of the respiratory anatomy of the Antarctic Weddell seal, Leptonychotes weddelli.

Journal of Morphology
R B Boyd

Abstract

Four species of Phocidae, or true seals, inhabit the waters surrounding the Antarctic continent. These animals are thought to have different diving capabilities. The Weddell seal, Leptonychotes weddelli, is known to be capable of attaining depths up to 600 meters. The respiratiory system of the Weddell seal shows the usual adaptations to an aquatic environment characteristic of other marine. These include lungs that undergo compression acollapse at depths greater than 70 meters; hyaline cartilage in the tracheo-bronchial tree as far as the terminal bronchioles; and large amounts of smooth muscle surrounding the distal-most bronchioles. The collapsible lungs provide a mechanism by which air is forced from the alveoli adjacent to the pulmonary capillary beds thereby preventing the absorption of nitrogen gas into the bloodsteam. The presence of hyaline cartilage throughout most of the tracheo-bronchial tree increases the effective dead air space that accommodates most of the air forced from the collapsed lungs. The smooth muscle surrounding the respiratory bronchioles prevents their collapse while under the pressures of a deep dive. Collapse of the respiratory bronchioles not supported by cartilage would trap air in the lung alveo...Continue Reading

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Citations

Feb 28, 2009·Anatomia, histologia, embryologia·H SmodlakaR B Reed
Jan 26, 2006·Anatomia, histologia, embryologia·H SmodlakaR W Henry
Oct 28, 2008·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Joy S Reidenberg, Jeffrey T Laitman
Jan 15, 2016·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Juha Laakkonen, Jukka Jernvall
Dec 1, 1983·Anatomia, histologia, embryologia·E E MorrisonS M Kruckenberg
Aug 1, 2006·Respiratory Physiology & Neurobiology·Natalie J FootChristopher B Daniels
Oct 19, 2016·Medicine and Science in Sports and Exercise·James H Jones
May 23, 2007·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Joy S Reidenberg
Jun 9, 2005·The Journal of Veterinary Medical Science·Hiroyoshi NinomiyaEtsuko Katsumata
Sep 9, 2020·The Journal of Experimental Biology·Arlo AdamsStacey A Skoretz
Jul 16, 2021·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Meghan Lee Bills Barboza, Beau Reyno

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