7. What do you call the tiny hair in the nasal cavity that filters the dust and other solid
particles in the air.
A. alveoli
B. cilia
C. mucus
D. nostrils

8. Where the exchange of carbon dioxide and oxygen takes place?
A nasal cavity
B. throat
C. trachea
D. lungs

9. The following are the function of the respiratory system EXCEPT.
A. act of breathing
C. transport blood and oxygen
B. taking in of oxygen
D. giving off of carbon dioxide

10. What is the most important organ of the nervous system?
A. brain
B. nerves
C. heart
D. spinal cord

11. What is the body system that composed of brain, neurons and spinal cord?
A. circulatory
B. nervous
C. digestive
D. excretory

12. What are the three parts of the nervous system?
A. brain, arteries, nerves
B. brain, nerve cells, spinal cord
C. brain, heart
D. spinal cord, heart, lungs

13. What is the main organ of the respiratory system?
A. mouth
B. lungs
C. heart
D. alveoli

14. What is the body system that breaks down the food into nutrients?
A. nervous
B. digestive boot
C. excretory
D. circulatory

15. What do you call the body organ that is like a bag but located in the upper part of the
abdomen?
A. lungs
B. stomach
C. heart boold
D. liver​