Ill 



In-art and partly in thi 

 heart is effected ll 



'•i^r.i mi the bl Ih, till 



The activity of tl 

 motor impul e disci 

 inu' from the \ arious r 

 active, \\ «• must Biippose thai rtin 

 afferent impulses t-. be tri 

 Upon W hich thej a<-t in 

 lion and a 1 «•<•.- 1 1 dilatation <>t" t i 

 perhaps a constriction of tin- bl I 



THE NERVE CONTROL OF THE HKA! \T 



The VagQfl Control 



With regard to the cot 

 alread that the ctrtth 



heart t«> quicken and the arterial bl I 



stimulation of the peripheral • 

 come bIom ed, if n<»t rtopped all 

 I ' ■•• thr more detailed in 



irt, it is i 

 imenl w hich, for <»1>\ r ious 



a COld-blooded animal. BUCl 



be performed in mammals pro> id( 

 The general effect of the vagus in 

 although apparent dif 

 portal ' he differenl pai 



gation of the heartbi 



The Cold Blooded Heart I 

 turtle nerve h • 



■ 

 tract 



in the a< iii|»an\ ;• 



is a w eakening of 1 1 

 the ventricle I 

 Buricular b< 

 mw hile t! 

 \ 

 it would seem • 



