HUMAN NUTRITION

Detailed explanation-1: -Mouth. The digestive process starts in your mouth when you chew. Your salivary glands make saliva, a digestive juice, which moistens food so it moves more easily through your esophagus into your stomach. Saliva also has an enzyme that begins to break down starches in your food.

Detailed explanation-2: -The correct order in which food passes through alimentary canal is: Mouth, pharynx, esophagus, stomach, small intestine, large intestine, anus.

Detailed explanation-3: -Mechanical digestion in the oral cavity consists of grinding of food into smaller pieces by the teeth, a process called mastication. Chemical digestion in the mouth is minor but consists of salivary amylase (ptyalin, or alpha-amylase) and lingual lipase, both contained in the saliva.

Detailed explanation-4: -The chemical digestion of two groups of molecules, carbohydrates, and fats, also begins in the mouth. Carbohydrates are the sugars and starches we eat, and an enzyme called salivary amylase begins the chemical breakdown of starches as we chew our food.