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 function of the digestive system is to break down these large molecules (called polypeptides) into smaller molecules (called amino acids). Pepsin in your stomach is an enzyme that chemically breaks down (hydrolyses) many protein molecules into less complex, smaller chains of amino acids.The stomach does not break down all proteins completely into amino acids.The digestion of protein is completed by the enzymes in the small intestine by another enzyme called trypsin. The relatively small molecules of amino acids enter the bloodstream in the small intestine.he stomach does not break down all proteins completely into amino acids. The digestion of protein is completed by the enzymes in the small intestine by another enzyme called trypsin. The relatively small molecules of amino acids enter the bloodstream in the small intestine.