The foods that we eat are consisted of organic and inorganic materials. The body cannot directly utilized this food if they will not be broken down. Foods should be broken down in order to be process by the body and use as energy.
This is possible in the process of digestion. Digestion reduces foods to smaller molecules that the body can absorbed. The function of the digestive system is to break foods into smaller and tiny particles and break this tiny particles into molecules to be able for them to dissolve in the body fluids. After dissolving in the body fluids, the foods now in the form of nutrients
passes through the cell walls and used by the body cells.
There are two parts in digestion, the mechanical part and the chemical part. In mechanical stage, the foods are break physically or mechanically. They are reduced into tiny pieces, by tearing, biting, cutting, grinding and smashing large bits of foods into fine mixture.
The process are done by the teeth, the tongue the contraction of the stomach, the peristalsis movement in the esophagus and the movement of the intestine.
The second is the chemical stage. In this process, foods was change into more soluble form, digestive enzymes hydrolyze and breakdown starch into glucose molecules, proteins into amino acids and fats into fatty acids and glycerol.
There are certain organs and structures that contributes in the digestive processes. This organs and structures forms the alimentary canal or food tube. It consisted the mouth, esophagus, stomach, small intestine, and anus.
There are also other organs or structures who does not have direct participation in the process of digestion. These are the salivary glands, pancreas,liver and gall bladder. These organs secrets enzymes which are use for chemical digestion.
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