Name
Date
Class
How Animals Obtain Oxygen
On a separate sheet of paper, explain why a mammal needs oxygen and how it obtains it.
223C
Name
Date
Class
How Animals Obtain Oxygen
Understanding Main Ideas
Answer the following questions on a separate sheet of paper.
1.
2.
3.
4.
5.
How is cellular respiration different from breathing?
How do animal cells exchange oxygen and carbon dioxide with their surroundings?
Why does carbon dioxide tend to diffuse out of animal cells?
What determines the type of respiratory system an animal has?
Explain why a mammal’s lungs are more efficient than the lungs of an adult
amphibian.
Building Vocabulary
Match each term with its definition by writing the letter of the correct definition in the
right column on the line beside the term in the left column.
6.
cellular respiration
a. the process in which particles move from an area of high
concentration to an area of low concentration
7.
diffusion
b. structures where gases are exchanged between air and
blood
8.
respiratory system
c. the structures an animal uses to exchange gases with its
surroundings
9.
gills
d. the process in which cells use oxygen to release energy from
digested food molecules
lungs
e. structures where gases are exchanged between water and
blood
10.