A mechanical essay upon the heart, in three anatomical lectures. Wherein I. The heart is demonstrated to be a compleat epitome of myology ... II. The origin and nature of the blood ... III. The praeternatural state of that fluid / By William Wood.

  • Wood, William, 1688-
Date:
1729
Catalogue details

Licence: Public Domain Mark

Credit: A mechanical essay upon the heart, in three anatomical lectures. Wherein I. The heart is demonstrated to be a compleat epitome of myology ... II. The origin and nature of the blood ... III. The praeternatural state of that fluid / By William Wood. Source: Wellcome Collection.

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    HERE, by the Gravitation of the Air, which is commonly reckoned to be equal to an hundred Pound weight, the Blood is compreffed, and its Motion proportionably accelerated. The grunious Particles are very much broke, and conlequently the whole Mai's, by this Contrivance, muft be made more fluid, and as it were, refitted for its next Voyage round the Mifcro- cofin. , N O W as the Air, ruihing into the Lungs by the Trachea Arteria, ventilates and gives a PalTage to the Blood into the Branches of the Arteria Tulmanalis: lo upon Expiration, or the Exit of the Air, the Cavity of the Thorax is contra&ed by its proper Mufcles, and the Blood, by the Preflure of the Lungs upon its Veffels, is forcibly repelled through the Vena , Titlmonulis into the left Auricle. A T the Entrance of this Vein, ’there are likewife a great many fleihy mufcular Fibres as a check upon the to0 great Redundancy of the accumulating Blood, while the left Auricle is, as I obferved before of the right Auricle in its >SyJlole: When the Blood has entered the Auricle it is thrown into the left Venticle, which was then in its T)iafiole; the tendinous Circle round the Mouth of the Auricle contrac¬ ting, and fo preventing the Blood’s return back again to the pulmonary Vein during its Sjftole. When the left Ventri¬ cle contracts, the Tapilla relaxing, as in the right Ventricle the Valvule Mitrales fpring up into the Pafiage where the Blood enter’d to prevent its return into the right Auricle again. N O W as the Blood which is lent hence through all the Ar¬ teries to every the remoteft Part of the Body muft have a Force proportionable to thofe Diftances, fo Nature has contrive Aiic oepum iiKewile —1 ' T this Ventricle being y g very ftrong and compact, fends off a