Digestive System in Humans

Food digestion

Process of breaking down food that is complex and large into molecules that are small, simple and soluble

Enzyme

Substance in the body that speeds up chemical digestion

Physical digestion

The process of breaking down food into smaller particles in the mouth with the help of teeth, tongue and saliva

Chemical digestion

The process of breaking down food from complex molecules into simple molecules with the help of enzymes

Happens in the mouth

Physical digestion

Happens in the mouth, stomach, duodenum and intestine

Chemical digestion

The flow of food particles

Mouth - Oesophagus - Stomach - Duodenum - Small intestine - Large intestine - Rectum - Anus

Examples of enzymes that involved in digestion

Amylase, protease and lipase

Absence of enzymes in digestion process

Happens at a very slow rate

Does not involve enzymes

Physical digestion