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Related post: belief that the heart and arteries dilate and contract simultaneously ; be- cause, if this were Acai Berry For Sale the case, nothing could be driven from one cavity into tbe o^er. Under the imposing authority of Galen, the opinion had long prevailed that the impulse of the arteries was derived from the heart by a sort of propagation along the parieties of the arteries, and not at all by the im- pctlae of the blood. But without refuting the absurd experiments by which Galen had established his theory, it was quite sufficient to answer, as Harvey did, that in an aneurism the pulsations are felt when the parie- ties of the artery have been entirely destroyed. But alter demdishing the old theories, the task yet remained of build- ing up a new fabric in their stead. It then became necessary for him to examine the movements ot the heart on Acai Berry Brazil living animals, and it is recorded of him that when this organ was exposed to view, and he beheld its sys- uAe and diastole taking place with almost the rapidity of thought, he sbnittk from the task, and exclaimed, with Fraoastor : ^' The movements of the h(«rt are known to God alone ! ^* He had nearly accepted the Aristototian comparison of Acai Berry Diet Capsules the ebb and flow of the tide, but he persevered 100 Pure Acai Berry and saw that as the animal grew weaker and life became nearly extinct, Digitized by 182 Neu) Orleans Acai Berry Online Medical New and ffoepital OatteUe, the dififerent phenomena of the heart's action became plainer. He alao attentively examined those movements on cold-blooded animals, and the final result of his studies was a master-piece of obsei^ation and philo- sophical analysis; so much so, indeed, that to this day scarcely anything has been added to his description. Harvey proclaimed that ihe movement of the heart is due to muscular action. He pointed oUt the shortening of the heart during its systole, and its projection fonvard at the same moment when it strikes the chest. It was maintained until then, and it has Acai Berry 100 Pure been lately repeated (Beau) that the impulse of the heart against the chest occurred during the diastole. The next step was to establish the circula- tion of the blood ; the proofs he derived from various sources. Acai Berry Australia In the first place, he ascertained the quantity of blood which passes through the heart in a given time. No one had ever an idea of the kind anterior to him. It was then that he made the foUowing celebrated calculation : ^Acai Berry Canada the food ; therefore, we are bound to admit that in a given time the whole mass of the blood goes repeatedly through the heart.'' He drew his arguments also from vene- section, showing that where a large vessel is opened the animal will lose all the blood in its body, and not that alone which is contained in a single vein. Harvey likewise ascertained the use of the valves which are found throughout the course of the veins Natural Acai Berry ; he insisted that their construction did not allow the blood to flow from but towards the heart, and he com- pared them to the sigmoid valves of the aorta and pulmonary artery. . When Harvey's work appeared, the great mass of physicians, anato- mists and physiologists denied the circulation of the blood. Acai Berry From Brazil Some, even, who admitted it, pretended that it had long been known, and attributed its discovery to others ; so that there were few who bowed in acknowledg- ment of truth, or rendered homage Acai Berry In Australia to the genius of that illustrious man- Yet Harvey lived to see his doctrines almost Acai Berry Sale universally admitted, and thirty-four years after the publication of his work, the last and most obstinate of his opponents publicly acknowledged his error and the truth of the new doctrines. Digitized by Prof, Bemard^^ LeOurei m the Blood. IK Though Harvey had prored irrefutably the oircnlation of the bloody and its passage from the arteries into Acai Berry Puree the veins, yet Acai Berry Antioxidants the ocular demonstration of this passage could not be given, and he himself was uncertain as to the manner in which the communication took place. He could not tell whether it was by direct vascular anastomosis, or by percolation through the porous though solid tissues. The direct demonstration was one of the earliest triumphs Acai Berry Supreme of the mioroscope, but Harvey died before witnessing this last confirmation of his theory. In 1661, Malpighuis saw the blood pass from the artery into the vein on the mesenteiy, lung and urinary Acai Berry Power 500 bladder of a frog. The same thing was more clearly demonstrated by Leuwenhoeck, in 1668, and after- wards O. Cooper observed the same phenomena in warm-blooded animals, vis., in the epiploon and mesenteiy of young dogs and cats. LBCTUBE II. The importance of an intimate acquaintance with the nature and pro- perties of the blood is easily conceived, when we reflect that Acai Berry 1000mg the production of blood b the most essential^ part of nutrition; for the blood Acai Berry Antioxidant being incessantly in motion, and frmiishing those materials which are required by the different tissues of the body, requires on its own part a constant reproduction of its elements. This production of the elements of the blood is the source of life, and the vital force and energy are in direct ratio with the quantity of blood generated in the system. On the other hand, the different pathological conditions of the blood give rise to* numer- ous symptoms which it is important to know and to distinguish from each other. The physiology of the blood is yet imperfect, and numerous problems are still open for investigation. The mioographers have shown us the blood corpuscles and their difierent properties; the Acai Berry Prices chemists have taught us the elementary composition of the blood and the changes which it undergoes in passing from venous to arterial blood. But acknowledging all the discoveries which are due to chemistry in ^e physiological seiences, we must, neverth^ess, admit that they went beyond their true limits when they undertook Brazil Acai Berry to explain all the phenomena of life by purely chemical laws. Lavoisier, who compared the body to a'frumaoe, lindertook to analyse all the materials which enter and those which are discharged from ^e organism, but that cannot account for the formation of the blood. 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