This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1815 Excerpt: ...Lieutaud. The heart may easily be supposed to be at all times of the same bulk. As the conditions of the different parts vary, the dimensions of the whole may remain the same. When the ventricles are in the diastole, the auricles are in the systole; when the auricles are in the diastole, the ventricles are in the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1815 Excerpt: ...Lieutaud. The heart may easily be supposed to be at all times of the same bulk. As the conditions of the different parts vary, the dimensions of the whole may remain the same. When the ventricles are in the diastole, the auricles are in the systole; when the auricles are in the diastole, the ventricles are in the systole; and, at any intermediate point, the ventricles and auricles-are in reciprocal proportion, with respect to their degree of dilatation. It is evident that in all these situations of the heart, the same quantity of blood, by which the difference in its bulk can alone be produced, may be contained by it. Suppose, in this case, the ventricles to be in the diastole and about to contract. A quantity of blood is thrown by this action out of the confines of the pericardium. To preserve the equilibrium of pressure between the contents of the pericardium and the substances without this envelope, the capacity of the pericardium will necessarily either be diminished to an extent that will be commensurate with the bulk of fluid, that has been expelled by the ventricles, or, the same bulk of fresh matter must be introduced into this cavity. From the convex surface of the pericardium, a share of the weight of the atmosphere is removed by the collapsing effort of the lungs. But the blood in the arteries and veins, with which the cavities of the heart have a communication, is subject to the usual pressure.--Valves and the condition of the ventricles at the moment prevent the return of blood from the arterial trunks. But the entrance of the venous blood is not opposed by valves, and is favoured by the condition of the auricles at the time.--The quantity of matter, therefore, required to occupy the space which the expulsion of blood from the ventricles would ...
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