Top Ten Powerful Nations 2013 (According to Global Presence). Top Ten Powerful Countries Ranking (2012). NOTE: National Power Index (NPI) 2012 is a comprehensively revised version of the previous National Security Indexes published in Indiaâs National Security Annual Review (INSAR) series since 2002.op Ten Powerful Nations 2013 (According to Global Presence). Top Ten Powerful Countries Ranking (2012). NOTE: National Power Index (NPI) 2012 is a comprehensively revised version of the previous National Security Indexes published in Indiaâs National Security Annual Review (INSAR) series since 2002.
Overview. When you take in food, it's the job of your digestive tract to break that food down into smaller pieces through mechanical digestion, and then break larger molecules into smaller ones through chemical digestion.
The stomach's main function is digestion. It does this by:   Storing the food we eat.  Breaking down the food into a liquidy mixture called  chyme.  Mixing enzymes and s â¦ tomach acids which is are chemicals that  break down food.  Slowly empties a liquidy mixture into the small intestine.     The stomach uses pepsin (enzyme) and peptidase (another enzyme) to  break down proteins in your food. The acid released by the stomach  doesn't break down food it only provides a good environment for the  enzymes to work in.