Question

Human digestive system is a tube running from mouth to anus. Its main function is to breakdown complex molecules present in the food which cannot be absorbed as such into smaller molecules. These molecules are absorbed across the walls of the tube and the absorbed food reaches each and every cell of the body where it is utilised for obtaining energy.

The contraction and expansion movement of the walls of the food pipe is called:

Identify the picture located in the human intestine?

What is its role in the digestive system?

Observe the picture carefully and write why do herbivores have longer small intestine than carnivores?