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Show Book H. 0f the Arterier of the Heart. 0f the Arteries of the Heart. 78; Book II. the Arteries, which is the Phlfe, commonly felt in the Wrifi, and is at the Learned @iemerbroeck backeth this Hypothefis by a farther argument, That the Blood being hot and thin, as it is rarefied and cafily moveable, and thereupon may be impelled from the Heart into the Arteries filled With fame inftant in all parts of the Body. Blood. Air ille, Anatonzer Lib. 6‘. [mg 807, Sanguine»! Arteriarum cfle rare- themby their peculiar power, without the afliitance of the Heart, cauv'ing :95??? the Dial'tole, flowing from the vigorous motion, tenlion and contraétioh ".‘Zulaa‘ fLWYIY faffmn, calidtmr, tenuem, @- hint facile mabilent, enmq", é‘ Cordez'mpeI/i in Arterinafunili fanguine antea replelm', uncle paulelum grad 6 Carole m Arteriam magnam prapellitur, mox ab illo pauxillo etiam necefl‘arzo totmn, quad omnibm Arterir}: imfl, fimul propelli, freq; omner Arteries eodem tempore fimul dijtendi, fi in (Ir/)e flannea, excl Scutellzz deponatur cirtulws Globnlorum Contzgnorum, 0' mm; commmanupromoveatur feu impellatur, ille proximum, alter tertium, (a fie deincepr omner eodenz momenta promowentur @ intpelluntur, int fe bnber in of the numerous firong flefhy Fibres of the Heart, but the Syflole of mm Arteriir, in quibm una partefangninir mom, mowentur owner. The contraction of thefe circular Fibres, caufing the Syl'tole of the Arteries, doth very much Contribute to the motion of the Blood, flowing This famous Author lllufirares the Motion of the Blood in the pullation of the Artery by the motion of many Bullets put into a Vellel, wherein one being moved, all do move; So that by this inftance he concludeth that the Bullets move at once, which feemeth to contradiét Reafon and Senfe, a fuccellire motion, and is done fo quickly, as it [cemeth to be but a mo. ment, whereas in truth it fuppofeth more. Andin like manner the Blood is carried out of the left Ventricle of the into all other parts of the Body,which is very much promoted by the motion $33353}; of CarnousFibres encircling Artery,elfe the Blood would have but a flow cur- Capillary Arrent upward through the alcendent Trunk of the Aorta and Carotide Arteries 5 335:." the Heart into the common Trunk of the Aorta, wherein it meeteth with a con- and efpecially in the fmall Capillary Arteries of the Brain, in which the Blood would become fiagnant, if its motion were not quickned by the Syf‘tole of from the beginning to the Terminations of the Arteries ; So that thefe San~ guiducts being propagated in many Flexures, by reafon of their numerous Divarications, muf't neceflarily give fuch a check to the over-hafiy current of the Blood, that it cannot be impelled from the Heart at one moment throng1h all the Arteries, which are feated at a great dif'tance from the Center. \Vhereupon Iconceive, that the motion ofthe Blood out ofthe left Chamber ofthe Heart, making the Diafltole (vulgarly thought) firll; in the common Trunk, and afterward in the afccndent and defcendent Trunk of the Aorta, and divers crooked branches of the leller Arteries, is not the caufe of the pulfarion of the Artery, which is performed in a moment in one brisk continued motion, and not fuccellively by way of Undulation, which fuppo- feth many Inl‘rants in which one part of the Artery is elevated after another, "VF-r1 [HIC- primarily from the Impulle, made in the Ventricles of the Heart by flirong becaufe though they be Contiguous, yet they prefs one another forward by all parts of the Body, which cannot be effeéted any other way than by undulating blotion, by prefling one part of the Blood forward after another ties, the Arteries is a motion diftinét from their Diafltole, formed by the tranfverfe or rather annular flefhy Fibres of the Arteries, whereby their cavity is narrowed, and the Blood preffed through their Channels with a greater quicknefs. contrafied Hefliy Fibres leflening their Cavities; whereupon the Blood is fquirted as by a Syringe out of the Right Chamber of the Heart into the Theturrent Trunk of the Pulmonary Artery, and out of the Left into the Aorta, and then $12,235,311: tinued lire-am of Blood, which by degrees is moved by divers Channels into The r‘n'r‘"? of 13 C l'nifd- The Syfiole of the Arteries is their proper motion, as made folely in The gym, as it growethdiflended by a great firearm of Blood; So that I imagine the pullation of the Arteries doth proceed from the vigorous contraétion of the right and left Ventricle of the Heart, to which the Trunks of the Pulmonary and great Artery are aflixed ; whereupon their Trunks being briskly Brook by the pulfation of the Heart,their continued Coats being ever dill'ended with Vital Liquor, have the Vibration immediately imparted to them in all parts, after the manner of an Impulfe made upon one part ofan extended Muiical firing, the fame {iroke is immediately tranfmitted to every part of it, as the whole firing is made up of one continued fubflance of a twifled Gut. So that, I conceive, the Diaftole of the Artery, taken in a firiét notion, is not made by the fucceflive motion of the Blood ( firflt produced in the Heart, and then carried out of it, into the common Trunk, and afterward into the Arteries, furnifhing all parts of the Body) but by the Syfiole of the Heart, firlt makinga Vibration in it ( which I have feen in a Dog diffeéted alive in the Colledg Theater) imparted in the fame moment to all parts of the the Arteries, produced by the Contraction of the flelhy circular Fibres. |