The book A Text book of Human Physiology was written by author Robert Tigerstedt Here you can read free online of A Text book of Human Physiology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Text book of Human Physiology a good or bad book?
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may be concerned. Xot all the vascular regions of the body are constricted, at least not to the same extent, when the pressure rises; for vasodilatation has often been observed in dilTerent organs, especially in the muscles. It is difficult to decide in many cases whether a given dilator effect is active or passive. It may be that with an increase of pressure produced by an extensive contraction of the splanchnic region, various other regions dilate only because of the high pressure. Or it may ...be that dilatation is actively produced, either by a decline in the tonus of the constrictor nerves or by stimulation of the dilator nerves. A fall in pressure obtained reflexly is caused by a reduction of tonus in some of the great vascular regions. But as in the case of a rise of pressure, the reduc- tion may be due either to stimulation of dilator nerves, or to diminished activity of the constrictors. After excluding all the vasoconstrictor nerves of the hind limb, Bayliss succeeded in demonstrating vasodilatation in the same region by stimulation of the vagus.
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