THE PRINCIPLES OF 

 PHYSIOLOGY 



CHAPTER I 



ITS SCOPE, AIMS AND RELATIONS 



1. PHYSIOLOGY is the science which describes 

 and endeavours to explain the phenomena 

 manifested by living beings. It may also be 

 said to treat of the changes that occur in 

 living matter. It deals with that special 

 mode of activity we call Life. 



2. Living beings are divided into plants 

 and animals. There are many forms difficult 

 to classify ; these seem to belong to either the 

 plant or the animal world, according to the 

 point of view from which we regard them. 

 All living things, however, show certain 

 general characters, by which we know they 

 are alive. They are developed from a parent 



or parents, they require food and oxygen, 

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