Eg: we will discuss about Digestive system 
      So we can divide D S in some parts 
1. What is the Anatomy of D S
2. what type of food we eating and how it will be digest in different organs 
3. Studied about digestion in particular organ 
4. What enzymes and factors are involved
5. Absorption and excretion of waste material 
        Eg: we will discuss about Digestive system 
      So we can divide D S in some parts 
1. What is the Anatomy of D S
2. what type of food we eating and how it will be digest in different organs 
3. Studied about digestion in particular organ 
4. What enzymes and factors are involved
5. Absorption and excretion of waste material