Digestive System questions
1. What are the two major purposes of the digestive system?
2. What is the difference between mechanical and chemical digestion?
3. The diagram below represents the action of a carbohydrase in the mouth. This
carbohydrase starts to change the complex carbohydrate (starch) to simple sugars. Foods
like potatoes and bread contain starch. Only a small amount of starch is digested in the
mouth. The rest is broken down in the small intestine.
What do the letters represent?
4. Carbohydrates
Elements
Building Blocks
Main use in the Body
Building Blocks
Main use in the Body
5. Proteins
Elements
6. Lipids
Elements
Building Blocks
Main use in the Body
7. Fill in the missing words
a) After passing through the oesophagus the food moves into the
.
b) The stomach produces a liquid called
.
c) Gastric juice contains
and
.
d) Proteases digest
faster in an
environment.
e) Protein digestion starts in the
and is completed in the
8. There are three substances that allow digestion to take place in the small intestine - bile,
pancreatic juice and intestinal juice. These three digestive juices come from three different
places.
Use the clues below to help you to work out where each substance comes from. Each
source is named in bold print.
Neither the bile, nor the pancreatic juice, comes from the small intestine.
The intestinal juice does not come from the pancreas.
The pancreatic juice does not come from the liver.
a) Bile comes from
.
b) Pancreatic juice is produced in the
c) The small intestine produces
.
.
9. Which of the two sorts of digestion is bile concerned with?
10. How does bile help lipase to work more efficiently?
11. If digestion is completed in the small intestine what must the secretions from the pancreas
and the intestinal wall contain?
12. Fill in the missing words
a) The parts of the digestive tract in the order through which food passes are:
b) Digestion starts in the
.
c) Digestion is completed in the
.
d) Digested food is absorbed in the
.
e) Food enters the stomach from the
.
f) Food enters the small intestine from the
.
g) Food enters the large intestine from the
.
h) Waste from digestion is stored in the
i) Digestive waste leaves the body through an opening called the
j) Some water and dissolved materials return to the body from the
.
.
.