The Digestive System Key Concept Builder LESSON 2 Key Concept

Name
Date
Class
Key Concept Builder
LESSON 2
The Digestive System
Key Concept What does the digestive system do?
Directions: Answer each question on the lines provided.
Question
Why is this important?
What is
ingestion?
1.
2.
How would you
define the next
step food goes
through?
3.
4.
What occurs
during
absorption?
5.
6.
Along with
undigested food,
what is
eliminated from
the body?
7.
8.
What happens
to food during
mechanical
digestion?
9.
10.
What happens
to food during
chemical
digestion?
11.
12.
What are
enzymes, and
what do they do?
13.
14.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
38
Answer
Digestion and Excretion
Name
Date
Class
Key Concept Builder
LESSON 2
The Digestive System
Key Concept How do the parts of the digestive system work together?
Directions: Complete this graphic organizer by choosing organs of the digestive tract from the word bank and
writing them in the correct order.
esophagus
large intestine
1.
mouth
small intestine
2.
3.
5.
4.
stomach
Directions: Answer each question on the lines provided.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
The Mouth
6. What organs in the
mouth begin the
mechanical digestion
of food?
7. What organs in the
mouth begin the
chemical digestion
of food? What do they
produce?
8. How do you know that
saliva begins chemical
digestion?
9. What else does saliva do?
Digestion and Excretion
39
Name
Date
Class
Key Concept Builder
LESSON 2
The Digestive System
Key Concept How do the parts of the digestive system work together?
Directions: Put a check mark under the organ(s) that each item describes.
Which organ or organs
are described by the
following?
Esophagus
Stomach
Small
Intestine
Large
Intestine
1. muscular tube
connecting the
mouth and stomach
2. large, hollow
muscular organ that
can expand like a
balloon
3. where most chemical
digestion takes place
4. produces pepsin, an
enzyme that helps
break down proteins
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
5. long tube where
chemical digestion
and nutrient
absorption occur
6. produces gastric juice
and forms chyme
7. folds of wall covered
by villi, where
nutrients move to
blood vessels
8. helped by pancreas,
liver, and gall bladder
9. tube about 2.5 cm in
diameter and 7 m long
10. tube about 5 cm in
diameter and 1.5 m
long
11. absorbs water and
stores solid waste
products
40
Digestion and Excretion
Name
Date
Key Concept Builder
Class
LESSON 2
The Digestive System
Key Concept How does the digestive system interact with other systems?
Directions: Answer each question or respond to each statement on the lines provided.
1. List the organs that are part of the digestive system but are not part of the digestive
tract. Next to each organ, describe what the organ does to help with digestion.
a.
b.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
c.
d.
2. Why are bacteria essential for proper digestion?
3. Explain how nutrients are absorbed in the small intestine and how they reach other
body systems.
Digestion and Excretion
41