The nasal cavity of the bearded seal: An effective and robust organ for retaining body heat and water.

Autor: Cheon HL; Department of Physics, Norwegian University of Science and Technology, NTNU, Høgskoleringen 5, Trondheim, NO-7491, Norway., Kizilova N; PoreLab, Department of Physics, Norwegian University of Science and Technology, NTNU, Høgskoleringen 5, Trondheim, NO-7491, Norway; Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, Nowowiejska 24, Warsaw, 00-665, Poland., Flekkøy EG; PoreLab, Department of Physics, University of Oslo, Sem Sælandsvei 24, Oslo, N-0371, Norway; PoreLab, Department of Chemistry, Norwegian University of Science and Technology, NTNU, Høgskoleringen 5, Trondheim, NO-7491, Norway., Mason MJ; Department of Physiology, Development & Neuroscience, University of Cambridge, Cambridge, CB2 3EG, UK., Folkow LP; Department of Arctic and Marine Biology, UiT - the Arctic University of Norway, Framstredet 39, Tromsø, 9019, Norway., Kjelstrup S; PoreLab, Department of Chemistry, Norwegian University of Science and Technology, NTNU, Høgskoleringen 5, Trondheim, NO-7491, Norway. Electronic address: signe.kjelstrup@ntnu.no.
Jazyk: angličtina
Zdroj: Journal of theoretical biology [J Theor Biol] 2024 Dec 07; Vol. 595, pp. 111933. Date of Electronic Publication: 2024 Sep 10.
DOI: 10.1016/j.jtbi.2024.111933
Abstrakt: We report the effects of varying physiological and other properties on the heat and water exchange in the maxilloturbinate structure (MT) of the bearded seal (Erignathus barbatus or Eb) in realistic environments, using a computational fluid dynamics (CFD) model. We find that the water retention in percent is very high (about 90 %) and relatively unaffected by either cold (-30 °C) or warm (10 °C) conditions. The retention of heat is also high, around 80 % . Based on a consideration of entropy production by the maxilloturbinate system, we show that anatomical and physiological properties of the seal provide good conditions for heat and water exchange at the mucus lining in the seal's nasal cavity. At normal values of tidal volume and maxilloturbinate (MT) length, the air temperature in the MT reaches the body temperature before the air has left the MT channels. This confers a safety factor which is expected to be helpful in exercise, when ventilation increases.
Competing Interests: Declaration of competing interest The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be constructed as a potential conflict of interest.
(Copyright © 2024 The Author(s). Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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