Name
(lass
Date
Note-taking Worksheet (continued)
Section 2
The Digestive System
A. Digestion-breaks
food down into
that can be absorbed by blood
1. __________
-food
2. __________
-chemical
is chewed, mixed, and churned
reactions break down food
B. Enzymes
1. Type of protein that
the rate of a chemical reaction in your body
2. Many enzymes are involved in the
of carbohydrates, proteins, and fats.
C. Organs of the digestive system
1.
organs-food
does not pass through them
a. Include the tongue, teeth, salivary glands,
2.
, and
_
a. Mouth-Here,
your
, and saliva change food into a soft mass.
h. Esophagus-muscular
tube moves food to the stomach using
, or
waves of muscle contractions
U
E
c. Stomach-Here,
food is digested
by peristalsis and
_
vi
'c'"
by digestive solutions with the help of enzymes. Food becomes a thin, watery liquid
o
called
co
c.
E
o
_
d. Small intestine-
increase the surface area to help absorption. Blood
transports the absorbed nutrients to cells.
e. Large intestine-Absorbs
from undigested chyme.
_
slows down so chyme can be in the large intestines as long as three days. The rectum and
anus control the release of
D. Bacteria live in many of the organs of your
from the body.
and make
_
your body needs.
Nutrients and Digestion
33
Name
~
Date
Class
Sedion 2 • The Digestive System
Directed Reading for
~--------
Content Mastery
Chapter
1m
Directions: Indicate which of the following digestive processes is at work in each organ shown in the diagram
by writing the correct letter in the space provided.
__
3. liver --
_
A. mechanical digestion
c. both
B. chemical digestion
D. none
Directions: Answer the following questions on the lines provided.
9. Describe mechanical digestion.
10. Where is hydrochloric acid produced in the body?
11. What is chyme?
12. What is peristalsis?
Nutrients and Digestion
21