PROBLEM 205 



237 



Problem 2O3 : To determine the rate of your own heartbeat. 



Method. Take your own pulse by placing the fourth finger 

 of your right hand on the left wrist, just at the base of the thumb 

 about one inch up on the wrist ; or place the finger on the side 

 of the head just in front of the ear. After getting the pulse, wait 

 for a signal, then count the number of beats for one minute. 

 Give your age and rate of your pulse per minute to a pupil chosen 

 to place the returns from the class on the board arranged " by 

 age." Classify boys and girls separately. 



Conclusion. 1. From this table make a graph that will show 

 the normal heartbeat of the pupils of your class. 



2. Does sex have anything to do with the rate? 



3. Does age? 



Problem 2O4 : What is the effect of hard mental work on the 

 pulse beat ? 



Method. Under the direction of the teacher do some hard 

 problems in arithmetic for about five minutes. Now count pulse 

 as before and tabulate. 



Conclusion. Does mental work affect the heartbeat? 



Problem 205 : What effect has exercise on the heartbeat P 

 Method. Under the direction of a leader, take a hard setting- 

 up drill for three minutes with the windows open. Count the 

 pulse beats as before and tabulate. Also note any difference in 

 respiration. 



