1. The brain is part of which organ system? __________ system

A. circulatory
B. digestive
C. nervous
D. skeletal

2. Which of the following organs continuously pumps blood through the body?

A. brain
B. heart
C. liver
D. lungs

3. Which of the following gas do we breathe in?

A. carbon dioxide
B. hydrogen
C. nitrogen
D. oxygen

4. The liver converts fat to energy we can use. What is the important liquid
substance used in this process?

A. bile
B. glucose
C. glycogen
D. vitamin K

5. This part of the brain is important for involuntary actions and reflex functions?
Which is it?

A. cerebellum
B. medulla oblongata
C. cerebrum
D. spinal cord

6. When blood circulates, what does the heart provide your body with?

A. nutrients
B. a way to get rid of waste
C. oxygen
D. all of these

7. When blood sugar is low, the liver __________.

A. utilizes sugar in the blood to form glycogen

B. produces blood sugar and stores it as glucose

C. utilizes the stored glucose and converts it to glycogen

D. utilizes the stored glycogen and supplies it to the blood

8. Which part of the brain enables Princess to memorize and recite a poem in front
of the class?

A. cerebellum
B. medulla oblongata
C. cerebrum
D. spinal cord

9. If the atria are the upper chambers of the heart, which of the following parts
are the lower chambers?

A. aorta
B. septa
C. valves
D. ventricles

10. What causes the release of air when exhaling?

A. The diaphragm expands with too much air. Excess air exits.

B. The lungs are squeezed when the diaphragm expands and the chest
becomes bigger. This causes release of air.

C. The lungs are squeezed when the diaphragm relaxes and the chest
becomes smaller. This causes release of air.

D. The diaphragm is squeezed when the lungs relax and the chest
becomes smaller. This causes release of air.​