IMMUNOLOGY

Detailed explanation-1: -Digestion begins in the mouth. The food is ground up by the teeth and moistened with saliva to make it easy to swallow. Saliva also has a special chemical, called an enzyme, which starts breaking down carbohydrates into sugars.

Detailed explanation-2: -Saliva contains an enzyme called ‘salivary amylase’ which starts the process of chemical digestion. It acts on starch and breaks it down to maltose. Chemical digestion i.e. the action of enzymes continue as food moves down the digestive tract.

Detailed explanation-3: -The mouth, or oral cavity, is the first part of the digestive tract. It is adapted to receive food by ingestion, break it into small particles by mastication, and mix it with saliva.

Detailed explanation-4: -Digestion starts when food is taken into the mouth, ground up by the teeth and moistened with saliva. Saliva has an enzyme called amylase that starts to break down carbohydrates into sugars. Movements of the tongue help to push the wet, soft mass of food to the back of the mouth where it can be swallowed.