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strategy

Dermal bone buffers CO2-induced acidosis Edit title

Turtle Edit living systems
Profile PhotoAskNature TeamJuly 18, 2017
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Dermal bone in turtles reduces acidity resulting from carbon dioxide build up by releasing calcium and magnesium carbonates into the bloodstream.

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References

“When CO2 was breathed there was a compensatory change in the strong-ion difference as manifest by an increase in plasma [HCO3–] that was approximately 10 meq/l both in the 10 and 20 degrees C turtles. The only significant associated strong-ion changes observed consistent with the ionic compensatory response were increases in total and ionized Ca2+ and total Mg2+. These results were unaffected at either temperature by surgical removal of the urinary bladder. Urine collected from cystectomized turtles showed no compensatory increase in acid excretion during hypercapnia; in fact, changes occurred in the opposite direction. Urinary excretion of HCO3– and urine pH increased significantly, whereas titratable acidity decreased significantly. No significant change occurred in ammonia excretion over the three days of hypercapnia. These data argue against compensatory roles for the kidneys and urinary bladder in this species and point to internal ionic exchanges involving bone and shell.” (Silver and Jackson 1986:1228)

Journal article
Ionic compensation with no renal response to chronic hypercapnia in chrysemys picta belliiAmerican Journal of Physiology - Regulatory, Integrative and Comparative PhysiologyJanuary 1, 1986
Silver RB; Jackson DC

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Journal article
Dermal bone in early tetrapods: a palaeophysiological hypothesis of adaptation for terrestrial acidosisProceedings of the Royal Society B: Biological SciencesApril 25, 2012
Janis CM; Devlin K; Warren DE; Witzmann F

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Web page
Body Armor for Breathing?Science NewsJanuary 1, 2012
Perkins S

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TurtleTestudinataUnranked Clade

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Idea Incubator 3

  • Pollution control

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  • Modifying carbon dioxide uptake

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  • Eliminating carbon dioxide

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In this issue: What Forces are at Work Here? Don Ingber and the Theory of Cell Tensegrity by Tom McKeag; a portfolio by Myoung Ho Lee; Perspectives on “Stories from the trenches” by Jamie Miller & Michael Helms; Nature, Where Art Thou? by Adelheid Fischer; a portfolio by David Goodsell; Interview with Annick Bay; and Envisioning Biomimicry Through an Ontological Lens by Colleen K. Unsworth, Thibaut Houette, Sarah J. McInerney, Austin M. Garner, and Peter H. Niewiarowski.

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