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Human Digestive System

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The Human Digestive System

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Do Now: 11/15/16 Take out your HW. HW: What your gut can’t stomach article and questions. Digestion quiz on THURSDAY! Do Now: 11/15/16 Take out your HW. Describe how a piece of chicken is digested differently in the mouth vs. in the stomach.

Protein Digestion in the Mouth and Stomach Mouth digests (breaks down) protein MECHANICALLY only (by chewing) Stomach digests (breaks down) protein both MECHANICALLY (churning) and CHEMICALLY using the enzyme Pepsin. Hydrochloric acid helps prepare the stomach. Bicarbonate is another chemical in the stomach that neutralizes the acid level

A Big Meal HW Article Answers 1) About 6 Cups 2) A mix of water, electrolytes (such as sodium, potassium and calcium) & enzymes called pepsin that breaks down proteins. 3) An enzyme that breaks down protein. 4) The mix of food found in the stomach. 5) Mucus lines the inside of the stomach.

Organs of the Digestive System: Stomach Notes The nutrient that is mainly digested here is protein. It is the site of mechanical and chemical digestion.

Stomach Notes Pepsin HCl Bicarbonate (neutralizes acid) The stomach produces Gastric Juices: ______________ (enzyme – works on protein) Hydrochloric acid (______) ________________ ______________________ Pepsin HCl Bicarbonate (neutralizes acid)

Hands-On Digestion A B Stomach Acid Digestive Juice “Pepsin” “Bicarbonate” One meatball

. pH Level Acid, Basic, or Neutral? Stomach Acid (HCl) Digestive Juice A: Pepsin Digestive Juice B: Bicarbonate Contents of the Stomach

Odor is from the chemical break down of nutrients. Analysis and Conclusion: Why do you think the mixture of meat and digestive juices in the bag has an odor? Why did you have to knead the bag with your hands? What did the plastic bag model/represent? What is the chemical name of stomach acid? Odor is from the chemical break down of nutrients. Kneading the bag modeled mechanical digestion (churning) in the stomach. The plastic bag represented the stomach. Stomach acid is hydrochloric acid (HCl).

Stevie Starr: Professional Regurgitator https://www.youtube.com/watch?v=QTrpBeGqn58