28 Sep Explain the digestion that occurs in the oral cavity.

Pre-Lab Questions:

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

 

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

 

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

 

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

 

Experiment 1: Microscopic Anatomy of the Digestive System

 

Post-Lab Questions

 

1.            Label the items in the following slide pictures. A- lamina propria

 

B- epithelial

 

C- submucosa

 

D- mucosal glands E- submucosa

 

 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? Its ventral

 

1.            Is the gallbladder superior or inferior to the esophagus? Inferior

 

2.            What digestive organ is the duodenum a part of? Small intestines

 

3.            What is the initial part of the large intestine called? The cecum

 

4.            What is the most inferior part of the digestive system? Anus

 

 

 

 

 

Experiment 3: Swallowing

 

Post-Lab Questions

 

1.            What did you notice about the movement of your tongue as you swallowed? It formed a canoe shape and then lifted upward as the water went down.

 

2.            What did you notice about movement in the throat region when you swallowed? Be specific. My head slightly lifted upward and I felt like my throat expanded to widen up my throat channel.

 

3.            What sounds did you hear when you listened to water traveling to the stomach? It sounded like a watery turbulent gurgle sound

 

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

 

Table 2: Color Observations

 

 

 

Test Tube            Initial Color         Final Color

 

1             

 

2             

 

3             

 

4             

 

Post-Lab Questions

 

1.            What is the purpose of mechanical digestion?

 

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

 

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

 

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

 

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.

 

5. 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?