The Digestive System

 The Digestive System

The human body is made up of countless millions of cells. Food is needed to build up new cells and replace the worn-out cells. However, the food that we take must be changed into substances that can be carried out in the blood to the places where they are needed. This process is called digestion.

The first digestive process takes place in the mouth. The food we eat is broken up into small pieces by the action of teeth, mixed with saliva, a juice secreted by glands in the mouth. Saliva contains digestive juices which moisten the food, so it can be swallowed easily.

From the mouth, food passes through the esophagus (the food passage) into the stomach for several hours. Then the food enters the small intestine. All the time the muscular walls of the intestine are squeezing, mixing, and moving the food onwards.

In a few hours, the foods change into acids. These are soon absorbed by the villi (microscopic branch projections from the intestine walls) and passed into the bloodstream.

4. What is “digestion” mean?

a. The process of building up new cells

b. The process of taking food into our mouth

c. The process of replacing worn-out cells

d. The process of providing energy for each cell

e. The process of changing food into substances that can be carried in the blood

5. What is the first digestive juice?

a. Enzymes

b. Glands

c. Intestine

d. Saliva

e. Esophagus

6. “The digestive system begins as soon as we put the food into the mouth.” This information can be found in paragraph...

a. One

b. Two

c. Three

d. Four

e. Five

7. Text 5 is called a/ an …

a. Description

b. Explanation

c. Exposition

d. Report

e. Review

8. The first paragraph of the text is called the …

a. Issue

b. Thesis statement

c. Orientation

d. Re-orientation

e. General statement

9. These are soon absorbed by the villi ... The word 'these' refers to .....

a. Foodstuffs

b. Villi

c. Acids

d. Juices

e. Cells