multiple choice quiz for 4th grade.

1. The respiratoy
System
THE FUNCTIONS OF THE RESPIRATORY SYSTEM ARE:
A. DIGESTING FOOD.
B. TAKING THE OXYGEN AND EXPELING THE CARBON DIOXIDE.
C. TAKING THE OXYGEN.
D. CARRYING CARBON DIOXIDE.

2. What gas does blood take
when we breathe in?
A. Carbon dioxide
B. Nitrogen
C. Oxygen and carbon dioxide.
D. Oxygen.

3. What gas do we expel when we
breath out?
A. Carbon dioxide.
B. Nitrogen
C. Carbon dioxide, oxygen and
nitrogen.
D. Oxygen

4. It is the organ located between the
mouth and the trachea…
A.The bronchi.
B.The bronchial tubes.
C.The pharynx.
D.The lungs.

5. What are the muscles that intervine in
breathing?
A. The quadriceps
B. The biceps
C. The diaphragm
D. The diapragm and the rib cage
muscles.

6. What happens in the alveoli?
A. They expand.
B. The alveoli are full of arteries.
C. The blood takes oxygen and
expel carbon dioxide.
D. The alveoli take the air.

7. Why do we breath in through our
nose?
A. Because the nasal cavity heats up the
air and takes the dust particles.
B. Because it is good manners.
C. Because is a social costum.
D. We breath in through our mouth.

8. One open question for you.
What does the diaphragm
do when breathing?