CIRCULATION OF THE BLOOD. 105 



(Fig. XIV. b;) thence it flows through the aorta, (Fig. 

 XIV. c,) the large branches of the arteries, (Fig. XIV. c?, e,) 

 and the minute branches of the arteries in all the parts of 

 the body, (Fig. XIV. /, /, /, /,) into the capillaries, (Fig. 

 XIV. g, g, g, g.) Thence, again, the blood flows into the 

 minute veins, (Fig. XIV. h, A, A, A,) and through the larger 

 veins, (Fig. XIV. z, &,) back to the auricle of the right side 

 of the heart, (Fig. XIV. /.) 



This is the general circulation, which carries the blood 

 from the left side of the heart through the whole body and 

 back to the right side of the heart. 



Next, the blood flows from the right auricle (Fig. XIV. I) 

 to the right ventricle, (Fig. XIV. m.) Thence it passes 

 through the great pulmonary artery (Fig. XIV. n) and the 

 great branches of the right and left lungs (Fig. XIV. o, o) 

 into the minute pulmonary branches, (Fig. XIV. p, p.) 

 From these it flows into the minute pulmonary veins, (Fig. 

 XIV. q, , , y,) and through the great pulmonary veins 

 (Fig. XIV. r, r) into the auricle of the left side of the heart, 

 (Fig. XIV. a.) 



This is the pulmonary circulation, which carries the blood 

 from the right side of the heart through all the lungs, and 

 back to the left side of the heart. 



CHAPTER III.- 



Action of the Heart. Motion of the Blood in the Arteries. 

 Quantity and Flow of Blood. Rate of Pulsation varies with Cir- 

 cumstances. Exercise. States of Mind and Feelings. Local 

 Circulation varies. We do not govern Circulation, but we may 

 disturb it. 



227. THESE organs of circulation are admirably contrived 

 for their purpose. The muscular texture of the heart 

 enables it to confact upon its contents, and expel them with 



