7.
The cells of the blood that carry oxygen are the :
a. Erythrocytes.
b. Leukocytes.
c.
Lymphocytes.
d. Thrombocytes.
8.
In an adult, a breathing rate of
breaths per minute is considered to be
normal.
a. 5 to 7.
b. 12 to 20.
c.
32 to 45.
d. 55 to 70.
9.
You are breathing normally. When you exhale, you expel:
a. All of the air in your lungs.
b. About 80 percent of the air in your lungs.
c.
Slightly over 50 percent of the air in your lungs.
d. About 20 percent of the air in your lungs.
10.
What is the primary purpose of the tricuspid and mitral heart valves?
a. They prevent blood flowing between the ventricles.
b. They prevent blood flowing between the atria.
c.
They prevent blood flowing from the ventricles into the atria.
d. They prevent blood flowing from the arteries into the ventricles.
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