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Lab 11

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Lab 11 Digestion System Part III Dr. Kim Wilson Lab Manual ... Chemical Digestion Enzymes large protein molecules produced by body cells Act as biological ... – PowerPoint PPT presentation

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Title: Lab 11


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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