Name
Date
Class
Circulation and Excretion
On a separate sheet of paper, tell whether a salamander has an open or closed circulatory
system and what kind of circulation pattern it has. Then explain how the salamander’s
circulatory system functions.
233D
Name
Date
Class
Circulation and Excretion
Understanding Main Ideas
Answer the following questions on a separate sheet of paper.
1.
2.
3.
4.
5.
How does an open circulatory system work?
How does a closed circulatory system work?
How does a single-loop circulatory pattern work?
How does a double-loop circulatory pattern work?
Why is a four-chambered heart more efficient than a
three-chambered heart?
Building Vocabulary
Fill in the blank to complete each statement.
6. The
blood.
is a hollow, muscular structure that pumps
7. Nitrogen-containing wastes, and excess salt and water are removed
by a vertebrate’s
system.
8. In the heart, a(n)
body.
receives blood from the
9.
are tiny, thin-walled blood vessels.
10.
is a watery fluid that holds wastes.
11. A chamber called a(n)
body.
pumps blood to the
12. An animal’s
to cells and takes away wastes.
13. The
the blood.
system transports needed material
filters nitrogen-containing wastes from