Multiple Choice Read each question very carefully. From the choices given after each question, choose the letter of your answer and write it on your answer sheet. Each correct answer corresponds to one point.

1. Mrs. Reyes is explaining the concept of respiration on her grade 9 students during their class in science. Which of the following statements should Mrs. Reyes choose to best describe respiration?

a. Respiration is the process of taking in oxygen.

b Respiration is the process of inhaling and exhaling.

c. Respiration is the process of transporting oxygen to the different parts of the body.

d. Respiration is the process of exchanging gases between the cells and the environment.

2. The air enters your nose and passes through your nasal cavity. Feel the air passing through your respiratory tract. Which among these parts of your respiratory system serves as the largest passage way of air going to your lungs?

a. Alveoli

b. Bronchi

c. Pharynx

d. Trachea

3. Which of the following parts of the respiratory system enable us to produce sound?

a. Pharynx

b. Bronchi

c. Larynx

d. Nasal cavity

4. The trachea is lined with cartilage all throughout its entire length, what is the purpose of this?

a. To prevent the trachea from collapsing.

b. To enable the trachea to perform peristalsis.

c. To prevent the trachea from getting close to the esophagus.

d. To prevent the trachea from being irritated by the air that enters.

5. Nasal cavity is one of the first parts of the respiratory in which air passes through. What actually happens to the air upon passing through this part?

a Air is filtered, cooled and moisten.

b. Air is filtered, warmed and moisten.

c. Air is filtered, cooled and dried up.

d. Air is filtered, warmed and dried up.

6. Bryan notices that his chest cavity changes its size every time he breathes and he is quite curious about this. Which of the following statements explains what happens to Bryan's chest cavity when he inhales?

a. His diaphragm relaxes

b. His diaphragm constricts

c. His diaphragm contracts

d. His diaphragm enlarges

7. Your science teacher told you that the air pressure inside the chest cavity differs during inhalation and exhalation of a person. He asked you to describe the air pressure inside the lungs when a person breathes. Which of the following statements will you choose to tell him to explain this mechanism?

a. inhalation creates more space and less air pressure inside the lungs.

b. Inhalation creates more space and more air pressure inside the lungs.

C. Exhalation creates less space and less air pressure inside the lungs.

d. Both Inhalation and exhalation have the same air pressure inside the lungs.

8. How can you describe the mechanism of gas exchange inside your lungs?

a. Oxygen and Carbon dioxide diffuse to and from the alveoli and veins respectively.

b. Oxygen and Carbon dioxide diffuse to and from the alveoli and arteries respectively.

c. Oxygen and Carbon dioxide diffuse to and from the alveoli and capillaries respectively.

d. Oxygen and Carbon dioxide diffuse inside the surface of the alveoli.

9. The hairs inside our nose are referred to as the cilia and filter the air that enters our respiratory tract.

a. True

b. False

c. Sometimes true

d. Sometimes false Addroset San Anvirtin Trece Martine City Suite

10. In which structure of the respiratory system do food and air pass through?

a Pharynx

b. Trachea II. True or False

c. Larynx

d. Nasal cavity​