In the human body the site of absorption of digested food is the small intestine

In the human body the site of absorption of digested food is the small intestine. How is the process of absorption carried out and why is absorption of digested food necessary?

Answer

• The small intestine has numerous finger like projections called villi which increase the surface area for absorption.
• The villi are richly supplied with blood vessels which take the absorbed food to each and every cell of the body.
• The digested food is necessary to be absorbed for obtaining energy / building of new tissues / repair of old or worn out tissues.