Digestive/Excretory System Storyboard

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  • Inside the mouth...
  • *Chew chew*
  • Chyme
  • Small intestine
  • Chewing is a form of mechanical digestion. Your incisors, cuspids, and bicuspids tear at your food while your molars grind the food into smaller pieces. Meanwhile, your salivary glands ooze saliva which contains amylase, which begins to break down the chemical bond in starches, making them sweet.
  • Villi: finger-like projections in the small intestine that increase the surface area for absorption.
  • After the food has been crushed into smaller pieces, the tongue pushes the clump of food, called a bolus, down your throat. Form the throat, the bolus enters the esophagus. The muscles in the esophagus called peristalsis, contract and push the bolus into the stomach.
  • In your stomach, proteins are broken down, and your food is turned into chyme, a mixture with oatmeal-like consistency that is made up of the swallowed food that has now been churned by the stomach's three smooth muscles. After an hour or two, the pyloric valve opens and spurts the chyme into the small intestine.
  • Pancreas: produces hormones that regulate blood sugar levels and produces enzymes that break down proteins, lipids, carbohydrates, and nucleic acids.
  • Once in the duodenum, the first section of the small intestine, small intestine, lipids, carbohydrates, and nucleic acids are broken down and the chyme goes through a process called absorption. During absorption, nutrients from the chyme are absorbed by villi in the small intestine.
  • Liver: produces bile that helps the pancreas in fat digestion.
  • From the small intestine, the chyme passes the appendix and enters the large intestine, aka the colon. The large intestine's job is to remove water from the undigested material that's left after absorption.
  • After the large intestine, the remaining waste matter, called feces, passes into the rectum and is expelled from the body through the anus.
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