The book A Text-Book of Physiology V.1 was written by author Foster, M. (Michael), Sir, 1836-1907 Here you can read free online of A Text-Book of Physiology V.1 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 Physiology V.1 a good or bad book?
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of the tubing. The waves a' are waves reflected from the closed distal end of the tubing ; this is indicated by the direction of the arrows. It will be observed that in the more distant lever VI. the reflected wave, having but a slight distance to travel, becomes fused with the primary wave. (From Marey.) At each stroke of the pump, each lever rises until it reaches a maximum (Fig. 60, la, 2a, &c.), and then falls again, thus describing a curve. The rise is due to the expansion of the part of t...he tube under the lever, and the fall is due to that part of the (JiiAP. IV.] THE VASCULAR MECHANISM. 275 tube returning after the expansion to its previous calibre. The curve is therefore the curve of the expansion (and return) of the tube at the point on which the lever rests. We may call it the pulse-curve. It is obvious that the expansion passes by the lever in the form of a wave. At one moment the lever is at rest: the tube beneath it is simply distended to the normal amount indicative of the mean pressure which at the time obtains in the arterial tubes of the model ; at the next moment the pulse expan- sion reaches the lever, and the lever begins to rise ; it continues to rise until the top of the wave reaches it, after which it falls again until finally it comes to rest, the wave having completely passed by.
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