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 Page 1


THE HUMAN BODY
Our Digestive System
Page 2


THE HUMAN BODY
Our Digestive System
D I G E S T I O N
As soon as we bite food, such as a
sandwich, it starts a journey
through our digestive system. The
entire process of digestion takes
about 3-4 hours.
Page 3


THE HUMAN BODY
Our Digestive System
D I G E S T I O N
As soon as we bite food, such as a
sandwich, it starts a journey
through our digestive system. The
entire process of digestion takes
about 3-4 hours.
The different organs of a digestive system are the Mouth,
food pipe, stomach, liver, pancreas, small intestine, large
intestine and anus.
Page 4


THE HUMAN BODY
Our Digestive System
D I G E S T I O N
As soon as we bite food, such as a
sandwich, it starts a journey
through our digestive system. The
entire process of digestion takes
about 3-4 hours.
The different organs of a digestive system are the Mouth,
food pipe, stomach, liver, pancreas, small intestine, large
intestine and anus.
MOUTH
The teeth in the mouth grind the food into smaller pieces. 
Saliva present in the mouth makes the food soft and turns it
sweet. This happens because saliva converts starch in the
food to sugar.
Page 5


THE HUMAN BODY
Our Digestive System
D I G E S T I O N
As soon as we bite food, such as a
sandwich, it starts a journey
through our digestive system. The
entire process of digestion takes
about 3-4 hours.
The different organs of a digestive system are the Mouth,
food pipe, stomach, liver, pancreas, small intestine, large
intestine and anus.
MOUTH
The teeth in the mouth grind the food into smaller pieces. 
Saliva present in the mouth makes the food soft and turns it
sweet. This happens because saliva converts starch in the
food to sugar.
FOOD PIPE
From the mouth, the food gets swallowed into the food
pipe also known as the esophagus. 
The food pipe takes the food to the stomach.
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FAQs on PPT: Digestive System - Science for Class 4

1. What is the main function of the digestive system?
Ans. The main function of the digestive system is to break down food into nutrients that can be absorbed by the body for energy, growth, and repair.
2. How does the digestive system work?
Ans. The digestive system works by breaking down food into smaller molecules using enzymes and acids, absorbing these molecules into the bloodstream, and then eliminating waste materials.
3. What are the main organs of the digestive system?
Ans. The main organs of the digestive system include the mouth, esophagus, stomach, small intestine, large intestine, liver, gallbladder, and pancreas.
4. How can I keep my digestive system healthy?
Ans. You can keep your digestive system healthy by eating a balanced diet high in fiber, staying hydrated, exercising regularly, managing stress, and avoiding smoking and excessive alcohol consumption.
5. What are common digestive system disorders?
Ans. Common digestive system disorders include acid reflux, irritable bowel syndrome (IBS), constipation, diarrhea, and gastroenteritis. It is important to consult a healthcare professional for proper diagnosis and treatment.
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