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In the human digestive system, food enters the mouth and mechanical digestion of the food starts by the action of mastication (chewing), a form of mechanical digestion, and the wetting contact of saliva. Saliva, a liquid secreted by the salivary glands, contains salivary amylase, an enzyme which starts the digestion of starch in the food; the saliva also contains mucus, which lubricates the food, and hydrogen carbonate, which provides the ideal conditions of pH (alkaline) for amylase to work, and electrolytes (Na+, K+, Cl-, HCO-3). About 30% of starch is hydrolyzed into disaccharide in oral cavity(mouth), After undergoing mastication and starch digestion, the food will be in the form of a small, round slurry mass called a bolus. It will then travel down the esophagus and into the stomach by the action of peristalsis. Gastric juice in the stomach starts protein digestion. Gastric juice mainly contains hydrochloric acid and pepsin. In infants and toddlers gastric juice also contains rennin to digest milk proteins. As the first two chemicals may damage the stomach wall, mucus and bicarbonates are secreted by the stomach, providing a slimy layer that acts as a shield against the damaging effects of the chemicals like concentrated hydrochloric acid and mucus also helps in lubrication. Hydrochloric acid provides acidic pH for pepsin. At the same time protein digestion is occurring, mechanical mixing occurs by peristalsis, which is waves of muscular contractions that move along the stomach wall. This allows the mass of food to further mix with the digestive enzymes. Pepsin breakdowns proteins into peptides or proteoses, which is further broken down into dipeptides and amino acids by enzymes in small intestine. Studies suggest that increasing the number of chews per bite increases relevant gut hormones and may decrease self-reported hunger and food intake.

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Human Digestive System - Health, Medicine and Anatomy ...
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Digestive System - Function and Organs | Biology Dictionary
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digestive-system-diagram | Human anatomy and physiology ...
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Digestive system | Structure of digestive system
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Human Digestive System Tract | Human digestive system ...
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How Much of Your Food Do You Actually Absorb? – Jane's ...
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Digestive System for Kids | Human Digestive System | Human ...
Can Digestive Enzymes Help With Weight Loss? - Minority Health
Can Digestive Enzymes Help With Weight Loss? - Minority Health
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Think Tank Centre: Chapter 6: Human Digestive System ...
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Human Body: Digestive System | Human body anatomy, Human ...
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Parts and Function of Digestive System for Med School ...
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Digestive System - Biology 109 with Foley at Washtenaw ...
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Digestive System Facts for Kids - Bodytomy
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Our digestive system and how to keep it happy | Human ...
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Organs In The Digestive System Diagram | Science Lesson Plans
Organs In The Digestive System Diagram | Science Lesson Plans
Function of the Digestive System - HubPages
Function of the Digestive System - HubPages
Digestive System Drawing at GetDrawings | Free download
Digestive System Drawing at GetDrawings | Free download
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The Digestive System – Nutrition: Science and Everyday ...
the components and functions of the digestive system ...
the components and functions of the digestive system ...
32 Label The Organs Of The Digestive System - Labels ...
32 Label The Organs Of The Digestive System - Labels ...
Digestive System Function - Bodytomy
Digestive System Function - Bodytomy
Digestive System - BIOLOGICAL SCIENCESBIOLOGICAL SCIENCES
Digestive System - BIOLOGICAL SCIENCESBIOLOGICAL SCIENCES
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Yoga mindfulness meditation and Digestive System are ...
The Digestive System (With images) | Digestive system ...
The Digestive System (With images) | Digestive system ...
32 Label The Organs Of The Digestive System - Labels ...
32 Label The Organs Of The Digestive System - Labels ...

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