1.The _________ are the primary organs of the respiratory system that fill your chest cavity and are protected by your rib cage.

2.How many lobes does the right lung has?

3.How many lobes does the left lung has?

4.About how many alveoli are clustered together inside each lungs?

5.The ______________________ is a sheet of smooth muscles located below the lungs and separates them from the abdominal cavity.

• A. Lungs

• B. Diaphragm

• C. Alveoli

• D. Bronchioles

6. During ___________________ , muscular contraction causes the walls of the chest cavity to expand so that the rib cage moves outward and upward.

• A. Excretion

• B. Exhalation

• C. Inhalation

• D. Respiration

7.During ____________, the ribs and diaphragm return to their original resting position.

• A. Excretion

• B. Exhalation

• C. inhalation

• D. Respiration

8.Which of the following is not a reason for breathing to raise?

• A. Exercise

• B. Fever

• C. Intense emotion

• D. Sleeping

9.What do you call the volume of air the is still contain in the lungs after we breathe?

• A. Residual volume

• B. Residual air

• C. Residential volume

• D. Residential air

10.What are the two phases of breathing?