A textbook of experimental physiology for students of medicine / by N.H. Alcock and F.O'B. Ellison ; with a preface by E.H. Starling.

  • Alcock, N. H. (Nathaniel Henry), 1871-1913.
Date:
1909
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Licence: In copyright

Credit: A textbook of experimental physiology for students of medicine / by N.H. Alcock and F.O'B. Ellison ; with a preface by E.H. Starling. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    LESSON VI THE ARTERIAL SCHEMA The investigation of the features of the circulation involves the consideration of a number of physical factors with regard to the motion of fluid in tubes, which can be studied on a model as well as or better than on the living animal. The student should, therefore, make certain that he thoroughly understands the elementary mechanical principles, before pro- ceeding to the consideration of the more strictly physiological factors involved in the circulation. The schema (Fig. 14) consists of a thick-walled rubber bulb, H, provided at each end with indiarubber valves in wide glass Heart H Fig. 14.—Schema of circulation. For simplicity the veins of the splanchnic area are placed in series with the systemic veins. tubes. This represents the left ventricle with the mitral and semilunar valves guarding the orifices into the auricle and into the aorta respectively. The valve, v, leads into the rubber tube, A, with elastic distensible walls, representing the arterial system. This leads into the wide glass tube, c. Part of this