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Lab 11 – Digestion System Part III

Lab 11 – Digestion System Part III. Dr. Kim Wilson. Lab Manual Reference. Reference in lab manual – pages 597 – 604 (introductory material only) Figure 39A.1 (page 599) – Flowchart of digestion and absorption of foodstuffs. Chemical Digestion.

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Lab 11 – Digestion System Part III

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  1. Lab 11 – Digestion System Part III Dr. Kim Wilson

  2. Lab Manual Reference • Reference in lab manual – pages 597 – 604 (introductory material only) • Figure 39A.1 (page 599) – Flowchart of digestion and absorption of foodstuffs.

  3. Chemical Digestion • Enzymes – large protein molecules produced by body cells • Act as biological catalysts • Increase the rate of chemical reactions without becoming part of the reaction • Hydrolases – digestive enzymes • Substrates – molecules on which enzymes act

  4. Mechanisms of Food Propulsion and Mixing • Deglutition (swallowing) • 2 phases: • 1. Buccal (mouth) • Voluntarily controlled, initiated with tongue • 2. Pharyngeal-esophageal • Involuntary, delivers contents to stomach

  5. Segmentation and Peristalsis • Peristaltic movements – major means of propelling food through digestive viscera • Waves of contraction followed by waves of relaxation • Segmental movements – local constrictions of the organ wall that occur rhythmically • Function to mix food with digestive juices and to increase the rate of absorption by moving different portions of the chymeover regions of the intestinal wall.

  6. PART 1: CHEMICAL DIGESTION ‑ SMALL INTESTINE • INSTRUCTIONS: • 1. Complete the sheet titled, "Student Guide ‑ Digestion Biokit: Intestinal Digestion A & B". Record the results in the spaces indicated and include in your lab report. • 2. Answer related questions on the Questions Sheet.

  7. PART 2: ABSORPTION IN THE SMALL INTESTINE • 1. Complete the sheet titled, "Student Guide ‑ Digestion Biokit: Absorption in the Small Intestine". Record the results in the spaces indicated and include in your lab report. • 2. Answer related questions on the Questions Sheet.

  8. PART 3: THE ACTION OF BILE • INTRODUCTION: • Bile is an emulsifying agent since it's necessary to break fats into small droplets before they can be digested. Fat emulsification by bile allows water to mix with small fat droplets, a necessary step in chemical digestion.

  9. INSTRUCTIONS • 1. Place an equal amount of water and oil in a test tube. • Record the results on the Results Sheet. • 2. Add a small amount of liquid dishwashing soap to the mixture and shake the test tube. Record the results on the Results Sheet. • 3. Answer related questions on the Questions Sheet.

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