162 



PRACTICAL PHYSIOLOGY 



artery lying close by influences the venous trace. V is due to the 

 filling of the auricle during the ventricular systole. The negative wave 



Fio. 162. Tambour-sphygmographs arranged for measuring the velocity of trans- 

 mission of pulse-waves. 



after V is probably due to the rapid dilatation of the ventricle and 

 entry of blood therein. The venous pulse and radial pulse taken 

 simultaneously demonstrate whether the cardiac rhythm and 



Fio. 163. Impulse (I.) and pulse curves (II.) The vertical lines, marking the 

 ascent of the pulse curve and the dicrotic 

 the semi-lunar valves. 



notch, indicate the opening and closing of 



sequence are normal. In pathological states extra systoles may 

 occur, or the ventricle beat independently of the auricle with its 

 own rhythm. Alterations in the auricle-ventricular bundle are 



