Mouth:
Certain drugs coming in contact with the mucosa of mouth and lower side of the tongue are absorbed into the blood capillaries lining them.
Stomach:
Absorption of water, simple sugars and alcohol etc. takes place in stomach.
Small intestine:
Principle organ for absorption of nutrients. The digestion is completed here and the final products of digestion such as glucose, fructose, fatty acids, glycerol and amino acids are absorbed through the mucosa into all blood stream and lymph.
Large Intestine:
Absorption of water, some minerals and drugs takes place in large intestine.
