Volume 177202
Formulae medicamentorum. Or, a compendium of the modern practice of physick. To which is prefixed an essay on the effects and uses of blood-letting / [Hugh Smith].
- Hugh Smith
- Date:
- 1772
Licence: Public Domain Mark
Credit: Formulae medicamentorum. Or, a compendium of the modern practice of physick. To which is prefixed an essay on the effects and uses of blood-letting / [Hugh Smith]. Source: Wellcome Collection.
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![§.9. The ventricles of the heart, it has been obferved ( §. 3.) are dilated and ex- cited into contraction by the returning ve- nous blood; and by the ceconomy of the circulation, the quantity expelled into the arteries at each fyftole or contraction will bear an exact and conftant proportion to that which enters into, and dilates the cavities in its diaftole: and this will be greater or lefs, according as the blood more or lefs abounds in the body. In proportion then as the circulating fluids are diminifhed or evacuated, the quantity to be received by the heart in its diaftole muit be leflened; in confequence of which, the quantity to be diftributed by the arteries to the different parts of the body muft’ like- wife be diminifhed, and every artery will become lefs full and diftended according to its fize and capacity. Hence we find, that after a copious phlebotomy, the pulfe be- comes fofter and eafter, and the heat, ten- fion, and compreffion of ‘the feveral parts ‘of the body equally remit in proportion to the evacuation which may have been made : hence likewife, as the refiftance to the con- traction of the arteries is in part taken off, and the moles movenda lefflened, the remain- ing blood will] be more readily fubfervient to the impulfive force of the arteries, which now will contract themfelves more eafily and _ readily, and haften the circulation of their con-](https://iiif.wellcomecollection.org/image/b30789540_0002_0026.jp2/full/800%2C/0/default.jpg)
