Enok Sanne, Slay Christopher, Abe Augusto S, Hicks James W, Wang Tobias
Zoophysiology, Department of Bioscience, Aarhus University, 8000 Aarhus, Denmark.
Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697-2525, USA.
J Exp Biol. 2014 Jul 1;217(Pt 13):2232-4. doi: 10.1242/jeb.099226. Epub 2014 Apr 15.
Interspecific allometric analyses indicate that mean arterial blood pressure (MAP) increases with body mass of snakes and mammals. In snakes, MAP increases in proportion to the increased distance between the heart and the head, when the heart-head vertical distance is expressed as ρgh (where ρ is the density of blood, G: is acceleration due to gravity and h is the vertical distance above the heart), and the rise in MAP is associated with a larger heart to normalize wall stress in the ventricular wall. Based on measurements of MAP in Burmese pythons ranging from 0.9 to 3.7 m in length (0.20-27 kg), we demonstrate that although MAP increases with body mass, the rise in MAP is merely half of that predicted by heart-head distance. Scaling relationships within individual species, therefore, may not be accurately predicted by existing interspecific analyses.
种间异速生长分析表明，蛇类和哺乳类动物的平均动脉血压（MAP）随体重增加而升高。在蛇类中，当心脏与头部之间的垂直距离用ρgh表示时（其中ρ为血液密度，G为重力加速度，h为心脏上方的垂直距离），MAP随心脏与头部之间距离的增加而成比例增加，且MAP的升高与更大的心脏相关，以使心室壁的壁应力正常化。基于对体长0.9至3.7米（体重0.20 - 27千克）的缅甸蟒的MAP测量，我们证明，尽管MAP随体重增加，但MAP的升高仅为根据心脏与头部距离预测值的一半。因此，现有种间分析可能无法准确预测单个物种内的比例关系。
