PHYSIO 1*1 



These obsen ations enable 

 plying 



pha ' • Durii 



tory, in) effect is produced by th< • b Btimulut 

 extra systoles \ •. 1 1 i • ■ 1 1 are pi ely mo ter in 



diastole the} occur, follow the application i h stimuli, 



suit- ... far exactly like those obtained \\\\\i a qu Bui 



.-unit In- r phenomenon now becomes evident; namely, I ollowing • 

 extra Bystole there is :i compensator} pause in the action of I 

 of such duration that, when the nexl natural I" 

 practically al the same time .is it would ha irred 



stimulus been applied. This will !>.• apparenl from th< 

 diagram Fig I 8 



|- should !'<• noted thai the refractor} period atly <limi: 



raising the temperatui the heart, rndeed, und< 



and with Btrong stimulation it may be possible to produce an aim 

 compli ■ ■ tanus 



The importance of knowing the above fad that 



enabled to explain the peculiar manner in which the ventricle 

 to stiiiluli transmitted to it from the sinus and tin* auricle Tl •■ m 

 lature of the auricle and ventricle of the mammalian heart • 

 continuous Bheet, but is 31 ted by b Bpace at the auriculov< 

 junction, across which, in specially organized structures, tl • 

 auricle is transmitl tricle. Sometin timuli 



frequent that the ventricular muscle is unable to res 

 lus transmitted t" it. with the result that marked irregularities in c 



■timi mi ISO . In this wa\ certain of th< 



larities ol i in man ran be explained. Thus, the Bo-callod 



• minus is due to ever} second beat ; 



• is therefi aerally weaker than the p 



ma I beats, and it is ;ilm"st always followed b} .1 rum;. 

 the inters 



iond beat is diminished it 



