. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. liar (Hiutrootlon e of preuure in id, ita maximum â iderable. r duration and may be luamed udeut wUl And 1 intensity, may id and the heart lounda may also en the heart is cardiao in ^ulse ^«Mmted, un far mlubfdup; the uid '⢠boomin; " tohed. 1 most distinctly ; while the soo- oota of the great d best over the jctively. When nd the ear, it is [ most distinctly ; and the
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. liar (Hiutrootlon e of preuure in id, ita maximum â iderable. r duration and may be luamed udeut wUl And 1 intensity, may id and the heart lounda may also en the heart is cardiao in ^ulse ^«Mmted, un far mlubfdup; the uid '⢠boomin; " tohed. 1 most distinctly ; while the soo- oota of the great d best over the jctively. When nd the ear, it is [ most distinctly ; and the first in ulse is also often the aorta in the , are close to the x>le ; hence it is nate directly be- ;he chest will at in our domestie igate' the subject ⢠on "nother per- owiuii^ to a va- to explain fully THE CIRCULATION OP THK BI/)OD. 986 in each case, but owing doubtless in great part to variations in anatomical relations. Tkt 0*«Mt of tht Soiiads of tho HMurt.âThere is general agreement in the view that the seoond sound is owing to ttie closure of the semilunar valves of the aortic and pulmonary vessels; the former, owing to their greater tension in conse- quence of the higher blood-pressure in the aorta, taking much the. larger share in the production of the sound, as may be ascertained by listening over these vessels in the exposed heart When these valves are hooked back, the second sound disap- pears, so that there can be no doubt that they bear some impor- tant relation to the causation of the sound. In regard to tixtflr§t sound of the heart the greatest diversity of opinion baa prevailed and still continues to exist. Tho fol- lowing among other views have been advocated by physiolo- i^ts: 1. The first sound is caused by the tension and vibration of the auriculo-ventricular valves. S. The first sound is owing to the contractions of the large mass of muscle composing the ventricles. 8. The sound is directly traceable to eddies in the P
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1890, bookyear1890
