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Why is the orientation of muscle of the stomach wall important? How does this contribute to its function? ”

Lab 16 The Digestive System BIO202L

Student Name: Click here to enter text.

Access Code (located on the lid of your lab kit): Click here to enter text.

Pre-Lab Questions:

”1. Explain the digestion that occurs in the oral cavity.”

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”2. What is the function of the liver in digestion? ”

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”3. What role does the gall bladder play in digestion? ”

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”4. Why is the orientation of muscle of the stomach wall important? How does this contribute to its function? ”

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Experiment 1: Microscopic Anatomy of the Digestive System

Post-Lab Questions

”1. Label the items in the following slide pictures. ”

A- Click here to enter text.

B- Click here to enter text.

C- Click here to enter text.

D- Click here to enter text.

E- Click here to enter text.

Draw the digital slide of the esophagus. Insert your drawing here. Remember that your drawing should have your name and access code handwritten in the background.

Draw the digital slide of the small intestine. Insert your drawing here. Remember that your drawing should have your name and access code handwritten in the background.

Draw the digital slide of the stomach. Insert your drawing here. Remember that your drawing should have your name and access code handwritten in the background.

Experiment 2: Virtual Model – Exploring the Digestive System

Insert screenshot of the gallbladder:

Insert screenshot of the vermiform appendix:

Insert screenshot of the duodenum:

Post-Lab Questions

1. Is the liver dorsal or ventral to the stomach?

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Is the gallbladder superior or inferior to the esophagus?

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What digestive organ is the duodenum a part of?

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What is the initial part of the large intestine called?

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What is the most inferior part of the digestive system?

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Experiment 3: Swallowing

Post-Lab Questions

”1. What did you notice about the movement of your tongue as you swallowed? ”

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”2. What did you notice about movement in the throat region when you swallowed? Be specific. ”

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”3. What sounds did you hear when you listened to water traveling to the stomach? ”

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Experiment 4: Chemical Digestion of Food: The Role of Enzymes

Table 2: Color Observations

Test Tube
Initial Color
Final Color

1
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2
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3
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4
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Post-Lab Questions

”1. What is the purpose of mechanical digestion? ”

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”2. Describe the color seen in each tube in terms of the amount of starch present. Explain why differences may exist. ”

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”3. Why does amylase from saliva stop working in the stomach? What other organ produces amylase? ”

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”4. Why is it necessary to wait 10 minutes before adding IKI solution to the test tubes? ”

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Experiment 5: Fetal Pig Dissection of the Digestive System

”Insert photo of your pig’s exposed liver with your name and access code handwritten clearly in the background: “

”Insert photo of your pig’s exposed stomach and small intestine with your name and access code handwritten clearly in the background: “

Post-Lab Questions

1. Briefly explain the process of digestion.

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What did the interior of the small intestine look like? What is it, and why is this structure important to the function of the small intestines?

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