The five key themes of physiology are as given below:Homeostasis and regulation- homeostasis is maintaining a constant internal body temperature. Structure and function relationships- this study is about the relation of anatomic structure with their functions. Compartmentation- is defined as the way organelles are present in the eukaryotic cells. Biological energy and transformation- the process of converting one form of energy to another form.Communication and information flow - the process of transferring the message takes place through chemicals.