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 



Blood 



/ 



/serum' digested food 

 Plasmas^ gl^^-^ \ waste products 



\^ , /red corpuscles 



Corpuscles<^^j^.^^ corpuscles 



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



JProhlem 206 : 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 



