(seq. 59)

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26 Lect. 2

which are not synchronous in their Pulsations, as
we have just Time enough to attend to their Difference, so that
the Pulse is successive, but very quick. This swell or Pulsation
of the Artery will grow less & less perceptibly from the beginning
to the End, & the least Arteries will have a lesser Swell in proportion
to their Size, because all the Branches together are larger than the
Trunk, & hence the Impetus will be taken off - Another Reason is
that the Action from the Beginning to the Branch will not be so
strong, because the Heart acts by [?] - When the Heart ceases to
Act, the nearest Part of the Artery will swell & then contract
again, but at a Distance, the Artery will be kept almost always
distended, for after the Action of the Heart ceases, the Contraction of
the Artery follows successively from it's Trunk to it's Branches;
which two Powers acting alternately, & the Power viz the Action of
the Heart still growing weaker, the Blood at a Distance from the
Heart will not move in Terks, as after the Heart Ceases to act.
All the Arteries lying between the Heart, & these distant Vessels cont-
ract along in an Undulatory Manner, hence in remote Branches
The Blood runs in a more equal Stream for this Reason the pulse
diminishes, & in fleshy Parts is not perceptible, because of so many
Branches - The Heart originally carries on the Circulation, &
the Arteries react in the Blood by contracting. Hence we see the
Necessity of their being possessed of muscular or ligamentous Fibres.

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