as also the variety and diversity organs that exist in the bodies animals in connexion with these matters, although I have made a vast number observations, I shall not speak till I can more conveniently set them forth in a treatise apart, lest I should held as wandering too wide present purpose, which the use and motion the heart, and charged with speaking things beside the question, and ther complicating and quitting than illustrating And now returning immediate subject, I with what yet remains for demonstration, that in the more perfect and warmer adult animals, and man, the blood passes from the right ventricle the heart the pulmonary artery, into the lungs, and thence the pulmonary veins into the left auricle, and from there into the left ventricle the heart. And, first, I shall show that this may and then I shall prove that in fact. THE BLOOD PASSES THROUGH THE SUBSTANCE OF THE LUNGS FROM THE RIGHT VENTRICLE OF THE HEART term papers sale INTO THE PULMONARY VEINS THAT this fX ssible, and that there nothing prevent from being SO, appears when reflect the way in which water permeating the earth produces springs and rivulets, or when speculate the means which the sweat passes through the skin, or the urine through the substance the kidneys. It well known that persons who use the Spa waters or those La Madonna, in the ter. ritories Padua, or others an acidulous or vitriolated nature, or who simply swallow drinks fellowship personal statement writing service the gallon, pass all off again within an hour or two the bladder. Such a quantity liquid must take some short time in the concoction must pass through the liver allowed all that the juices the food consume pass twice through this organ in the course the day must flow through the veins, through the tissues the kidneys, and through To those, therefore, whom I hear denying that the blood, aye, the whole mass the blood, may pass through the substance the lungs, even as the nutritive juices percolate the liver, asserting such a proposition impossible, and no means entertained as credible, I reply, with the poet, that they are that race men who, when they will, assent custom essays cheap full readily, and when they will not, no manner means who, when their assent wanted, fear, and when not, fear not give The substance the liver extremely dense, that the kidney the lungs, however, are a much looser texture, and if compared with the kidneys are absolutely spongy. In the liver there no forcing, no impelling power in the lungs the blood forced the pulse the right ventricle, the necessary effect whose impulse the distension the vessels and the pores the lungs. And then the lungs, in respiration, are perpetually rising and falling motions, the effect which must needs open and shut the pores and vessels, precisely as in the case a sponge, and parts having a spongy structure, when they are alternately compressed and again are suffered expand. The liver, the contrary, remains at rest, and never seen dilated or constricted. Lastly, if no one denies the possibility in man, oxen, and the larger animals generally, the whole the ingested juices passing through the liver, in order reach the vena cava, for this reason, that if nourishment these juices must needs get into the veins, and there no other way but the one indicated, why should not the same arguments held avail for the passage the blood in adults through the lungs? Why not maintain, with customized essays Columbus, that skilful and learned anatomist, that must from the capacity and structure the pulmonary vessels, and from the fact the pulmonary veins and ventricle corresponding with them, being always found contain blood, which must needs have come from the veins, and no other passage save through the lungs? Columbus, and also, from what precedes, from dissections, and other arguments, conceive the thing clear. But as there are some who admit nothing unless upon authority, let them learn that the truth I contending for can confirmed from Galen's own words, namely, that not only may the blood transmitted from the pulmonary artery into the pulmonary veins, then into the left ventricle the heart, and from thence into the arteries the body, but that this effected the ceaseless pulsation the heart and the motion the lungs article writer in There are, as everyone knows, three sigmoid or semilunar valves situated at the orifice the pulmonary artery, which effectually prevent the blood sent into the vessel from returning into the cavity the heart.

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Now Galen, explaining the use these valves, and the necessity for them, employs the following language There everywhere a mutual anastomosis and inosculation the arteries with the veins, and they severally essay help live chat transmit both blood and spirit, certain invisible and undoubtedly very narrow passages. Now if the mouth the pulmonary artery had stood in like manner continually open, and nature had found no contrivance for closing when requisite, and opening again, would resume writing service business plan have been impossible that the blood could ever have passed the invisible and delicate De Usu partium, cap. mouths, during the contractions the thorax, into the arteries for all thingS are not alike readily attracted or repelled but that which light more readily drawn in, the instrument being dilated, and forced out again when contracted, than that which heavy and in like manner anything drawn more rapidly along an. ample conduit, and again driven forth, than through a narrow tube.

But when the thorax contracted the pulmonary veins, which are in the lungs, being driven inwardly, and powerfully compressed every side, immediately force out some the spirit they contain, and at the same time assume a certain portion blood those subtle mouths, a thing that could never come pass were the blood at liberty flow back into the heart through the great orifice the pulmonary artery.

But its return through this great opening being prevented, when compressed every side, a certain portion distils into the pulmonary veins the minute orifices mentioned.

And shortly afterwards, in the next chapter, says The more the thorax contracts, the more strives force out the blood, the more exactly these membranes viz.

the semilunar valves close the mouth the vessel, and suffer nothing regurgitate.

The same fact has also alluded in a preceding part the tenth chapter Were there no valves, a threefold inconvenience would result, that the blood would then perform this lengthened course help dissertation in vain would flow inwards during the disastoles the lungs and fill all their arteries but in the systoles, in the manner the tide, would ever and anon, like the Euripus, flow backwards and forwards the same way, with a reciprocating motion, which would nowise suit the blood. This, however, may seem a matter little moment but if meantime appear that the function respiration suffer, then I think would looked upon as no trifle, etc. Shortly afterwards says And then a third inconvenience, no means thought lightly would follow, were the blood moved backwards during the expirations, had not our Maker instituted those supplementary membranes. In the eleventh chapter concludes That they the valves have all a common use, and that prevent regurgitation or backward motion each, however, having a proper function, the one set drawing matters from the heart, and preventing their return, the other drawing matters into the heart, and preventing their escape For nature never intended distress the heart with needless labour, neither bring aught into the organ which had been better have kept away, nor take from again aught which was req uisite should brought. Since, then, there are four orifices in all, two in either ventricle, one these induces, the other educes. 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