Physiology and biochemistry in modern medicine . Fig. 52.—Diagram of an auricle showing the arrangement of the muscle bands; the concen-tration point (); and the outline of the node (). The diagram is to scale, andillustrates by the circles and connecting dotted lines the method of leading off by paired contactsand the subsequent orientation. (From Thomas Lewis.) i Auricular appendage--5/noaurfcu/ar node. Auriculoventricular nodeAurlculoventricular bundle Rights left ventricularbundles Musculi papillares Fig. 53.—Diagram to show the general ramifications of the conducting tissue
Physiology and biochemistry in modern medicine . Fig. 52.—Diagram of an auricle showing the arrangement of the muscle bands; the concen-tration point (); and the outline of the node (). The diagram is to scale, andillustrates by the circles and connecting dotted lines the method of leading off by paired contactsand the subsequent orientation. (From Thomas Lewis.) i Auricular appendage--5/noaurfcu/ar node. Auriculoventricular nodeAurlculoventricular bundle Rights left ventricularbundles Musculi papillares Fig. 53.—Diagram to show the general ramifications of the conducting tissue in the heart ofthe mammal. It will be observed thai there is none of this tissue between the sinoauriculo- andauriculoventricular nodes. the study of polysphygmograms (page 273), of electrocardiograms (page266), and of observations on the heart during heart-block (page 270).Our problem therefore narrows itself down to determining the exactpoint of the right auricle at which the beat originates. THE PHYSIOLOGY OF THE HEARTBEAT 187 SITE OF ORIGIN OF THE BEAT The working hypothesis from which \vc may proceed to attack thisproblem is that the heat originates in the sinoauricular node, and to put this to the test, various methods have been employed: (1) Warmingor cooling or injuring the node and noting the effect on the procedures greatly affect the rate of the heartbeat, whereas theyproduce no chan
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