Class 11 Biology Digestion Absorption Absorption of digested products

Absorption of digested products

  • Absorption is the process by which the end products of digestion pass through the intestinal mucosa into the blood or lymph.
  • Some of the substances like fructose and some amino acids are absorbed with the help of the carrier ions like Na+ and this mechanism is called the facilitated transport.
  • Transport of water depends upon the osmotic gradient and active transport occurs against the concentration gradient and hence requires energy.
  • Fatty acids and glycerol being insoluble are first incorporated into small droplets called micelles which move into the intestinal mucosa.
  • Micelles are re-formed into very small protein coated fat globules called the chylomicrons which are transported into the lymph vessels (lacteals) in the villi.
  • Absorption of substances takes place in different parts of the alimentary canal, like mouth, stomach, small intestine and large intestine.
  • The absorbed substances finally reach the tissues which utilise them for their activities. This process is called assimilation.
  • The egestion of faeces to the outside through the anal opening (defaecation) is a voluntary process and is carried out by a mass peristaltic movement.

Class_11_Biology_Digestive_System_LymphVessels

Fig. Lymph vessels in the villi

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