English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In the isolated, perfused dog's tongue, alterations of pulse pressure, at constant mean pressure, can produce parallel or oppositely directed changes in blood flow or can leave the flow unaffected. Parallel changes occur when the vascular bed is passively distensible; opposite changes occur when active contraction of smooth muscle overcomes the effects of passive distensibility, and no change is found when the two effects balance. The first is seen at mean pressures below 80 mm Hg or peak pressures above 155 to 165 mm Hg. The other reactions are produced in the mean pressure range in which autoregulatory reactions occur, viz. opposite changes when the pulse pressure is low and no change under conditions close to in situ mean and pulse pressure. Even when pulse pressure has no observable influence on flow, therefore, it modifies vascular tone. The active response of vascular smooth muscle to pulse pressure persists in part after the removal of the stimulus, opposing stress-relaxation of resistance vessels. Tissue weight changes reflect alterations in capacitance vessel volume which may vary in direction from the volume changes occurring in resistance vessels.

Interaction of Mean and Pulse Pressures in the Circulation of the Isolated Dog Tongue