The mechanical properties of the systemic and pulmonary arteries of Python regius correlate with blood pressures

Journal of Morphology
Benjamin J van SoldtTobias Wang

Abstract

Pythons are unique amongst snakes in having different pressures in the aortas and pulmonary arteries because of intraventricular pressure separation. In this study, we investigate whether this correlates with different blood vessel strength in the ball python Python regius. We excised segments from the left, right, and dorsal aortas, and from the two pulmonary arteries. These were subjected to tensile testing. We show that the aortic vessel wall is significantly stronger than the pulmonary artery wall in P. regius. Gross morphological characteristics (vessel wall thickness and correlated absolute amount of collagen content) are likely the most influential factors. Collagen fiber thickness and orientation are likely to have an effect, though the effect of collagen fiber type and cross-links between fibers will need further study.

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Citations

Mar 17, 2018·American Journal of Physiology. Heart and Circulatory Physiology·Junjing SuUlf Simonsen
Jul 21, 2020·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Renato FilogonioTobias Wang
Feb 26, 2021·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Renato FilogonioDane A Crossley
Jul 6, 2021·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Renato FilogonioDane A Crossley
Aug 8, 2021·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Renato FilogonioCléo A C Leite

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