Human Digestive System | Physical Digestion | Process of Digestion | Science
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This educational video explains about Human Digestive System. This will help them a lot in their daily routine.
Physical digestion, also known as mechanical digestion, is the process of breaking down food into smaller particles through physical actions such as chewing, churning, and mixing. It occurs primarily in the mouth and the stomach. The main goal of physical digestion is to increase the surface area of food, which facilitates the subsequent chemical digestion process.
Here are the key aspects of physical digestion:
1. Chewing: In the mouth, the teeth break down food into smaller pieces through the process of chewing or mastication. Chewing not only reduces the size of the food but also mixes it with saliva, which contains enzymes that initiate the chemical breakdown of carbohydrates.
2. Mixing and churning: In the stomach, muscular contractions known as peristalsis help to mix food with gastric juices and break it down further. The stomach muscles contract and relax, creating a churning motion that turns the food into a semi-liquid mixture called chyme.
3. Segmentation: In the small intestine, another process called segmentation occurs. It involves the contraction of the intestinal muscles in a way that mixes the partially digested food with digestive enzymes and facilitates the absorption of nutrients.
4. Surface area increase: By physically breaking down food into smaller particles, physical digestion increases the surface area available for enzymes to act upon during chemical digestion. This enhances the efficiency of nutrient absorption.
It's important to note that while physical digestion helps break down food into smaller pieces, it is complemented by chemical digestion. Chemical digestion involves the action of enzymes and acids that break down food molecules into simpler substances that can be absorbed by the body.
Together, physical and chemical digestion work in coordination to ensure proper digestion and absorption of nutrients from the food we consume.
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Human Digestive System | Physical Digestion | Process of Digestion | Science

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