Why are the substances absorbed by the villi of the small intestine transported to the organs? 

The bloodstream transports the absorbed substances from the small intestine to the various organs, tissues, and cells of the body, where they are assimilated. 

The nutrients are used by the cells during assimilation to perform their functions and to build and repair tissues. 

The byproducts of assimilation are then discarded as waste or used to generate energy. 

The process of absorption and assimilation is a continuous cycle that contributes to the body's overall health and well-being.