These parts can be broken down into different component groups. Although both

substances contain all four food groups, the bread accounts mainly for

carbohydrates and cellulose (roughage), whilst the meat mainly accounts for

proteins and lipids. Before the hamburger can be absorbed and used by the body,

it firstly has to be broken down into small molecules, which can then pass into

A piece of the hamburger is bitten off by the teeth. The teeth tear and grind the

hamburger, with the aid of the tongue, which positions the food between the teeth

and mixes it with saliva. Mastication breaks the food into smaller pieces,

enlarging the surface area for better enzyme action. The digestive enzyme

amylase, is found in the saliva, which in turn is produced in the mouth. The

amylase starts to digest the polysaccharide, starch (carbohydrate), before the

pyloric sphincter. This release acts as a stimulus. The hamburger is further

Chyme is a soup-like substance. It is released into the small intestine, by the

llowed. The hamburger has now entered the alimentary canal.

peptidases into amino acids and complete the digestion of the carbohydrates by

Secretin acts on the liver and pancreas. It causes the liver to secrete bile,

Some topics in this essay:
, CCK-PZ Secretin, glycerol fatty, chemical digestion, glycerol fatty acids, chyme duodenum, pancreas secrete, hamburger broken, fatty acids, complete digestion, amino acids, stimulates secretion, broken pieces,