Lesson 3.4: Another View of the Digestive System

Insert the science.connect1   CD into your computer.  Load the applet "The Digestive System" and work through all of the pages.

Question 1. What extra parts of the digestive system were discussed in the CD activity that were not discussed in this course material?

Question 2. What is the scientific name given to the waves of muscle contractions in the esophagus that pushes the chewed food down towards the stomach?

Question 3. How long is food processed in your stomach before it is slowly released into the small intestine?

Question 4. What is the pH of the digestive juices in your stomach?

Question 5. What are villi?

 

 

Check your answers with those that follow.

 

 

 

 

 

 

 

 

 

 

 

 

Answers to Questions:

Question 1. What extra parts of the digestive system were discussed in the CD activity that were not discussed in this course material?

The esophagus and the anus were in the CD activity but were not discussed in this course material. 

Question 2. What is the scientific name given to the waves of muscle contractions in the esophagus that pushes the chewed food down towards the stomach?

Peristalsis is the scientific name given to the waves of muscle contractions in the esophagus that pushes the chewed food down towards the stomach.

Question 3. How long is food processed in your stomach before it is slowly released into the small intestine?

Food is processed in your stomach for about four hours before it is released into the small intestine.

Question 4. What is the pH of the digestive juices in your stomach?

The pH of the digestive juices in your stomach is about pH = 2.

Question 5. What are villi?

Villi are tiny finger-like projections.  In the small intestine the villi greatly increase the surface area which increases the rate of nutrient absorption.

 


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