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PPT: Digestive System
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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.Read More
FAQs on PPT: Digestive System
| 1. What are the main parts of the digestive system and what does each one do? |  |
Ans. The digestive system has six main parts: mouth (breaks down food), oesophagus (carries food to stomach), stomach (mixes and digests food), small intestine (absorbs nutrients), large intestine (absorbs water), and rectum (stores waste). Each organ plays a specific role in breaking down food and moving it through the digestive tract until it becomes waste that leaves the body.
| 2. How does the stomach digest food and why does it need acid? | |
Ans. The stomach produces strong acids and enzymes that break food into smaller pieces through a process called chemical digestion. Gastric juices contain hydrochloric acid, which softens food and kills harmful bacteria. This acidic environment allows digestive enzymes to work effectively, turning solid food into a thick liquid paste called chyme before it moves to the small intestine for further nutrient absorption.
| 3. Where does most nutrient absorption actually happen in the digestive tract? | |
Ans. The small intestine is where most nutrient absorption occurs, not the stomach or large intestine. Its inner walls contain millions of tiny finger-like structures called villi that increase surface area dramatically. These villi absorb proteins, carbohydrates, fats, vitamins, and minerals into the bloodstream. The small intestine is therefore the most important organ for getting nutrients from digested food into your body.
| 4. What's the difference between mechanical and chemical digestion in the mouth and stomach? | |
Ans. Mechanical digestion uses physical action-teeth chew food in the mouth, and the stomach churns it-to break food into smaller pieces. Chemical digestion uses enzymes and acids to break chemical bonds in food molecules. In the mouth, saliva contains amylase enzyme starting chemical breakdown. In the stomach, hydrochloric acid and pepsin enzyme continue this process, making both types essential for complete food breakdown.
| 5. Why do we need the large intestine if most digestion happens in the small intestine? | |
Ans. The large intestine absorbs water and remaining minerals from undigested food waste, preventing dehydration. It also contains beneficial bacteria that produce certain vitamins and aid digestion. The large intestine compacts leftover waste into solid faeces for elimination. Without the large intestine's water reabsorption, the body would lose too much water with every bowel movement, leading to severe dehydration.
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Document Description: PPT: Digestive System for Class 4 2026 is part of Science for Class 4 preparation. The notes and questions for PPT: Digestive System have been prepared according to the Class 4 exam syllabus. Information about PPT: Digestive System covers topics like and PPT: Digestive System Example, for Class 4 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for PPT: Digestive System.
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