ASSIGNMENT ON RESPIRATION Name____________ S2 BIOLOGY Class_____________

Roll No___________

Q1. Circle the letter of the choice that best completes the statement or answers the question.

1. During the process of respiration,

a. oxygen is delivered to body cells. b. carbon dioxide is expelled from the body.c. oxygen is used in cells to produce ATP. d. all of these.

2. When you swallow, your epiglottis momentarily covers the top of the trachea so that

a. you can swallow more easily. b. you can breathe more easily.c. you don’t get food in your air passages. d. you can cough up foreign matter.

3. The cilia that line your trachea and bronchi

a. produce dirt-trapping mucus. b. help in the exchange of oxygen and CO2.c. move mucus and dirt upward. d. only beat when you inhale.

4. The first branches off the trachea are called

a. bronchioles. b. bronchi. c. arterioles. d. alveoli.

5. Inside the alveoli, carbon dioxide and oxygena. are exchanged between air and blood. b. are transported along microscopic tubules.c. are produced inside cells. d. are exchanged for other gases.

6. Which is the correct sequence for the path of oxygen through the respiratory system?

a. nasal passages, bronchi, trachea, bronchioles, cells, blood, alveolib. cells, blood, alveoli, bronchioles, bronchi, trachea, nasal passagesc. nasal passages, blood, alveoli, bronchi, cells, trachea, bronchiolesd. nasal passages, trachea, bronchi, bronchioles, alveoli, blood, cells

Q2. For each statement below, write true or false.

.____________________ 8. As you exhale, the bronchioles in the lungs release most of their air.____________________ 9. When you inhale, the muscles between your ribs contract.

____________________ 10. Relaxation of the diaphragm causes a slight vacuum in the lungs.____________________ 11. Air rushes into the lungs because the air pressure outside the body is greater than the air pressure inside the lungs. ____________________ 12. Relaxation of the diaphragm causes it to flatten.

Q3. In the blank, write the word or words that best complete the sentence.

1. Clusters of thin-walled sacs found in the lungs are called _____________________________

2. A disease that causes alveoli to lose their ability to expand and contract is ._______________

3. The passageway for moving air into and out of your body is the _______________________.4. The substance in red blood cells that binds with oxygen is____________________________ .5. The thin sheet of muscle under your lungs is your .__________________________________

6. Tiny hairlike structures that line nasal passageways, trachea, and lungs are .______________

7. Bronchial tubes become constricted in a lung disorder called ._________________________

II. Concept ReviewIf the underscored word or phrase makes the sentence true, write “TRUE” in the space provided. If theunderscored word or phrase makes the sentence false, write the correct term or phrase in the spaceprovided.

8. An earthworm is a complex organism that doesn’t need a trachea forrespiration._____________________

9. During cellular respiration, oxygen combines with stored energy in cells.______________

10. The gas that causes exhaled air to feel moist is carbon dioxide._____________________

11. Hemoglobin is a good oxygen carrier because it contains iron, which easilybinds with oxygen.__________________________________

12. One way to keep your respiratory system healthy is to get plenty of exercise. ___________

Number the following in their correct order.

13. Describe inhalation.

_________Air fills lungs.

_________Diaphragm contracts, and muscles pull ribs upward and outward._________Air pressure inside the lungs decreases.

14. Describe how oxygen gets to your heart.

________Oxygen-rich blood moves to the heart.

________Oxygen binds with hemoglobin in the red blood cells.

________Oxygen diffuses into the capillaries.

________Oxygen-rich air flows into the alveoli.