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PRACTICAL LESSONS 



IN 



HUMAN PHYSIOLOGY 



CHAPTER I 



INTRODUCTION 



1. Why we should study the Human Body. We all 



wish to become strong, useful, and happy members of 

 society. In order that this goal may be reached it is 

 necessary to properly care for our bodies. We must 

 learn early to habitually do those things which will 

 make the body strong, robust, and healthy, and to avoid 

 all those things which tend to hinder growth, enfeeble 

 the body, and cause disease. 



The human body is a wonderful machine that must 

 be understood if it is to serve its purpose best. This 

 book attempts to explain in a simple way these bodies 

 of ours, and to teach us how to care for them properly 

 in health, and how to prevent disease. 



2. The Human Body. We all know that the body 

 consists of the head, arms, trunk, and legs; that it is 

 covered with skin, and that it is made up of bones, 

 muscles, nerves, blood, etc. We know that the dif- 



