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2H1 - Digestion questions

1. What is the technical name for the mouth?

2. There are four kinds of teeth in the mouth

a. What are the four types called (in order from the middle outwards)?

b. What is the purpose of each type?

3. Saliva is secreted in the mouth. It has three main purposes – what are they?

4. The food is formed into a bolus in the mouth.

a. What helps to form the bolus?

b. What tube does the bolus pass into?

5. In the tube on the way to the stomach…

a. What cells are the walls made of?

b. What enzyme is present?

c. What is the purpose of this enzyme?

d. How is the bolus moved along, other than by gravity?

6. The bolus passes into the stomach. The pH is very acidic there

a. What stops the stomach wall getting damaged by the acid?

b. What type of food is not broken down in the stomach?

c. Food is churned in the stomach – what part of the stomach helps to do this?

d. The food now passes through a sphincter into the small intestine – what is this sphincter called?

7. The food enters the small intestine

a. What is the first part of the small intestine called?

b. What is the food now called?

c. Two fluids are secreted into the duodenum. One is bile – what is the other?

d. What do both the fluids help to restore?

e. What is the other purpose of the bile?

f. Where is the bile secreted?

g. Where is the bile stored?

h. In the other fluid (not bile) what type of enzymes are there?

8. The food now enters the next stage of the small intestine

a. What is the next stage called?

b. All carbohydrate molecules will now be in what form?

c. What is the typical pH?

d. The walls of this part of the intestine are lined with X. What are X?

9. This question is about the X in the previous question

a. What is the main purpose of X?

b. What two enzymes are on the surface of the X?

c. What is the purpose of these enzymes?

d. What runs through the X?

e. Give the three ways in which the carb molecules are exchanged

f. Why are the X well suited to exchange?

g. What else is on the surface of the X?

Also See

• Exchange and Breathing Revision Questions (A Level)

Comments

These notes were originally written by iainmacn in this thread on TSR Forums.