The document discusses the human digestive system and the process of digestion. It begins by explaining that digestion in the mouth involves chewing food into smaller particles with teeth. Saliva is then secreted which contains enzymes like amylase to break down carbs and lysozyme to prevent infections. The chewed food is then swallowed down the esophagus into the stomach through coordinated movements of the tongue and epiglottis.

1. DIGESTION

2. HUMAN DIGESTIVE SYSTEM

3. DIGESTION OF FOOD
The process of digestion is accompanied
by mechanical and chemical process

4. DIGESTION IN MOUTH
• Digestion of food begins in the mouth.
• The food ingested is masticated by teeth
(chewed) and broken into smaller particles so
that the surface area provided for the action
of enzyme.
• The food is mixed with saliva secreted by
salivary glands which helps to moistens and
lubricates the food and aids in swallowing.

5. • Saliva is alkaline in nature, contains an
enzyme called amylase and lysozyme.
• Amylase converts starch into maltose
Salivary amylase
Starch Maltose
• Lysozyme present in saliva act as an
antibacterial agent that prevent infections.
• Saliva helps to digest carbohydrates in our
mouth

6. • The masticated food is rolled into a ball or
bolus by the tongue and passed to the
pharynx into oesophagus by swallowing.
• During this process the epiglottis closes and
prevent the food from entering the trachea
(wind pipe)- enters the stomach.