Circulation in Animals


   
 
Closed Circulatory System in Humans
The closed circulatory system can be represented as follows.
 
                  
 
                   
             Diagram showing inter-relationship between artery, vein and capillary
 
The closed blood vascular system is a very well developed system
 
This is so because,
 
a) The organisms have a thick body wall to prevent the evaporation of water, so exchange of materials between the body cells and the environment by diffusion is not possible.
 
b) The organisms have higher metabolic rate and need a greater supply of nutrients and oxygen. They also need a more quick removal of wastes and carbon dioxide.
 
c) External changes of temperature.
 
 
     
   
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