1. Mouth and oesophagus
The first step in the digestive process takes place in the mouth. The teeth chew up the food into smaller pieces, which are then thoroughly mixed with saliva to form a mixture called chyme. This action breaks down carbohydrates already present in the food into smaller constituents. After swallowing, the mixture passes along the oesophagus (approx. 25-30 cm long) into the stomach.