Archive image from page 202 of Directions for laboratory work in Directions for laboratory work in physiology for the use of medical students directionsforlab00lomb Year: 1914 CAROTID rULSlJ IN MAN. 173 EXPERIMENT XXX. The Carotid Pulse in Man. The Form of the Pulse Wave, and Bifect of Arterial Pres- sure. The pulse is a wave of pressure which is transmitted along- the arterial system when the heart drives blood into the aorta. Each systole raises the pressure suddenly, giving what is called the systolic pressure, and during the follow- ing diastole the pressure falls, until, just before the
Archive image from page 202 of Directions for laboratory work in Directions for laboratory work in physiology for the use of medical students directionsforlab00lomb Year: 1914 CAROTID rULSlJ IN MAN. 173 EXPERIMENT XXX. The Carotid Pulse in Man. The Form of the Pulse Wave, and Bifect of Arterial Pres- sure. The pulse is a wave of pressure which is transmitted along- the arterial system when the heart drives blood into the aorta. Each systole raises the pressure suddenly, giving what is called the systolic pressure, and during the follow- ing diastole the pressure falls, until, just before the next systole, the diastolic pressure is reached. The amount that the pressure changes, that is the difference between the systolic and diastolic pressures is known as the pulse pres- sure, while the pressure midway between the systolic and diastolic is for ordinary purposes spoken of as the mean pressure, although on account of the distribution of the pres- sure values from systole to systole, it is not the true mean. A B Fig. 34. Sphygmograms of two pulse beats, one taken when the pressure was quite high and the other when it was quite low. A, crest of primary wave; B, dicrotic notch; C, dicrotic wave. Under ordinary conditions the caliber of an artery can- not be seen to change when the pulse wave travels through it; nevertheless, if the vessel be slightly compressed by the finger, the pressure change can be felt, and if the finger has been trained, not only the extent but character of the pulse wave, and the amount of the systolic and the diastolic pressure can be more or less accurately estimated. If a
Size: 2624px × 762px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
