CHAP. IX 



THE HKAKT 



79 



in^ away from you, the left side of the heart will then be on 

 your left hand. Notice that the left side, including the whole 

 of the apc-x of the heart, is firm and unyielding, while the right 

 side is soft and flabby. 



On each side of the base of the heart there is situated a 

 flat car-like structure, and the wall of the part of the heart on 



Ao 



RA* 



LV 



Fir,. 38. The sheep's heart. Front view. 



R, right .side ; I,, left side ; AT, right ventricle; LV, left ventricle; RAx, appendix of 

 right auricle ; LAjr, appendix of left auricle ; PA, pulmonary artery ; . /<, ;iort.i ; 

 x, iti first large branch. 



which each rests is soft and thin. These are the right 

 auricle and the left auricle, as the two upper chambers 

 arc called. Each of the car- like structures is called the 



