The Digestive System

The Digestive System

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  • There is food ready for the human to consume.
  • The food travels down the esophagus. Peristalsis begins. 
  • The human places the food in the mouth. Teeth grind the food into smaller particles and saliva breaks down the food with an enzyme called salivary amylase.
  • Peristalsis is a process that occurs in the digestive tract. It is when muscles behind the food contract to push the food and muscles in front relax to pull the food.
  • Gastric juice inside the stomach is mixed with the food to break it down further.
  • Gastric juice is made up of hydrochloric acid, pepsin, and rennet. Pepsin converts food into peptone as hydrochloric acid speeds up the reactions by breaking food down.
  • The liver produces bile, which helps emulsify fats, which allows them to pass through the intestines.
  • The stomach releases chyme, the processed food, into the intestines.
  • The pancreas releases insulin and other chemicals used in the digestive tract. Insulin tracks glucose levels in the bloodstream.
  • The food enters the small intestine, where more digestive juices break down the chyme. A variety of bacteria create enzymes to digest carbohydrates and nutrients are absorbed through the small intestine to the body. 
  • Water is absorbed in the large intestines and waste products of digestion are stored in the rectum until a bowel movement, where waste is pushed out of the body.
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