AnswersCO-Biology B-CRUnit Test

The Circulatory and Respiratory Systems Answers

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1
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Which component of blood allows oxygen from the air to move from the lungs to cells of the body?

A
white blood cells
B
platelets
C
plasma
D
red blood cells
2
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Which is the next structure to contact air after it passes from the nose to the nasal cavity?

A
the pharynx
B
the larynx
C
the bronchus
D
the trachea
4

Which statement explains blood pressure?

A
Blood pressure is highest in the veins near the heart.
B
Blood pressure is highest in the arteries near the heart.
C
Blood pressure is highest in the veins farthest away from the heart.
D
Blood pressure is highest in the arteries farthest away from the heart.
5

Gerald is lightheaded and tired from a lack of oxygen in his tissues.What is most likely the reason he feels this way?

A
His plasma level is high.
B
His white blood cell count is high.
C
His platelet count is low.
D
His red blood cell count is low.
6

Which statements describe the movement of blood through the heart? Select two options.

A
Blood from the veins enters the ventricles.
B
Atria and ventricles contract at the same time.
C
Atria push blood into the ventricles.
D
Valves allow for two-way blood flow.
E
Ventricles push blood out of the heart.
7

Which gases are carried by red blood cells? Select two options.

A
oxygen
B
helium
C
carbon dioxide
D
nitrogen
E
hydrogen
8

[BLANK]

A
Atria
B
Ventricles
C
Valves
D
Capillaries
9

The picture represents the respiratory system.

Question illustration
A
the pharynx
B
the larynx
C
the trachea
D
the bronchus
10

Which best describes carbon dioxide’s path out of the body?

A
nose → pharynx → larynx → trachea → bronchus → alveoli
B
alveoli → trachea → bronchus → larynx → pharynx → nose
C
alveoli → bronchus → trachea → larynx → pharynx → nose
D
nose → larynx → pharynx → trachea → bronchus → alveoli

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