238 



THE BLOOD AND ITS CIRCULATION 



Conclusion. 1. What effect does exercise have on the rate 

 of the heartbeat ? Can you explain the reason ? 



2. Can you explain the difference in the rate of respiration? 



3. Make two graphs superimposed on the original graph (Prob- 

 lem 203), using different colors to indicate the difference between 

 the normal and the other results found in the subsequent experi- 

 ments. 



Summary of Circulatory System 



Fill in the following outline. 



SUMMARY OF BLOOD 

 , water 



/serum digested food 

 >i 



Blood 



Plasma fibrin was te products 



^ /red corpuscles 



Corpuscles<vv hite corpuscles 



Fill out the above table and account for each part of the blood. 



Problem 2O6 : How to stop the flow of blood in case of an 

 accident. 



Method. Decide first whether the blood is issuing from an 

 artery or from a vein. How would you know? Then apply a 

 tourniquet made from a stick or ruler and a handkerchief 

 or towel, using a stone or knife to press down on the blood 

 vessel. Apply between the heart and the cut. 



Imagine the arm to be severed below the elbow and practice 

 applying a tourniquet on the brachial artery; on the femoral 



