284 DIGESTION, CIRCULATION, AND ABSORPTION 



tion of the blood as shown on the web of a frog's foot, or tail 



of a tadpole, etc. Capillary Network 



FIG. 65. Capillary network, showing connection of arteries and veins. 



b. Your Body 



Method. Place a finger of your right hand on the artery of 



the left wrist, just 

 at the base of the 

 thumb. Count the 

 number of pulsa- 

 tions after you 

 have been sitting 

 quietly, after rising 

 and again sitting, 

 and after a little ex- 

 ercise or light gym- 

 nastics. (All stand 

 for this phase of 

 the exercise and 

 try a " setting up " 

 exercise for a half 

 minute or so.) 



FJG. 60. Diagram showing how the heart acts as a Jrva ion. 



force pump. What is the pulse 



