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Anatomy of Vertebrates, Vol. 2

Excerpt from Anatomy of Vertebrates, Vol. 2 121. Thermogenous Conditions. - Life is attended with constant molecular change; and such vital motion becomes converted directly, or through intermediate modes of chemical or electrical force, into that of heat; the chief chemical action preceding or producing the calorific force being due to the introduction of oxygen by air or food into the body, where it operates in a manner analogous to combustion. The evolution of animal heat more directly relates to the amount of air inspired in a given period, and to the rapidity with which the oxygenated blood is conveyed to the tissues. In these the molecular changes arc governed by the nervous system, and whatever tends to paralyse the nervous force operates in the same degree in arresting those molecular movements on which more directly depends the evolution of heat. In this act the nervous system is accordingly concerned, in so far as it influences the exercise of the muscular movements. In the H matotherma, or Warm-blooded Vertebrates, the Atmosphere is directly inspired and applied to a vascular surface which, in proportion to the bulk of the body, is much more extensive than in any of the H matocrya. For mechanical convenience the respiratory surface is closely packed, in small compass, by subdivision of the pulmonary cavity into countless minute cells, giving to the lung a spongy texture, obliterating all trace of a visible or conspicuous cavity. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."
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