Section I: Multiple Choice Questions
Select the correct answer:
1. One reason for emphysema is:
- A) smoking
- B) exercise
- C) food
- D) iron deficiency
2. In humans during expiration:
- A) diaphragm is lowered and ribs are raised
- B) both diaphragm and ribs are raised
- C) diaphragm is raised and ribs are lowered
- D) both diaphragm and ribs are lowered
3. The inner most chamber of the respiratory system into which air can be drawn:
- A) bronchioles
- B) bronchus
- C) bronchial tube
- D) alveoli
4. What is the percentage of oxygen in expired air when a person is resting?
- A)
- B)
- C)
- D)
5. Which process does not use energy released by respiration?
- A) active transport to the glucose into the villi
- B) diffusion of oxygen across the alveolar surface
- C) maintenance of constant body temperature
- D) passage of nerve impulses
6. Which path does a molecule of oxygen take as it enters the body?
| A) bronchiole bronchus larynx trachea |
| B) bronchiole bronchus trachea larynx |
| C) trachea bronchiole bronchus alveolus |
| D) trachea bronchus bronchiole alveolus |
7. When you inhale, the diaphragm:
- A) relaxes and moves upward
- B) relaxes and moves downward
- C) contracts and moves upward
- D) contracts and moves downward
8. Respiration in living organisms always involves:
- A) carbon dioxide production
- B) energy release
- C) gaseous exchange
- D) oxygen consumption
9. The gas exchange portion of the human respiratory system is the:
- A) trachea
- B) bronchi
- C) larynx
- D) alveoli
10. The disease involving breakdown of air sacs of the lungs is:
- A) pneumonia
- B) bronchitis
- C) emphysema
- D) asthma
11. Which blood vessel surrounds the alveoli?
- A) capillary
- B) vein
- C) venule
- D) artery
12. In asthma, shortness of breath occurs due to:
- A) constriction of bronchi.
- B) rupturing of alveolar walls.
- C) rupturing of bronchial walls.
- D) accumulation of pus in alveoli.
13. The percentage of oxygen gas in inspired is and in expired air it is . This difference in the amount of oxygen gas is due to the:
- A) storage of oxygen gas in lung tissues.
- B) non-reactivity of oxygen gas with the blood.
- C) liberation of oxygen gas as a metabolic waste.
- D) utilisation of oxygen gas in energy production.
14. Which one of the following row best describes the action of different structures associated with the process of inhalation?
| Diaphragm | Rib muscles | Ribs |
| A) contract | relax | remain unchanged |
| B) relax | relax | raised |
| C) contract | contract | raised |
| D) relax | contract | remain unchanged |
15. Which row correctly describe the functions of the diaphragm, cilia and mucous in human gaseous exchange system?
| Diaphragm | Cilia | Mucous | |
| A) | Contracts to cause breathing out | Trap bacteria from air | Absorb CO, coming from alveoli |
| B) | Contracts to cause breathing in | Carry mucous to the throat | Trap dust and bacteria from air |
| C) | Relaxes to cause breathing in | Filter dust from air | help in sound production |
| D) | Relaxes to cause breathing out | Produce mucous | Decrease acidity |
Section II: Short Questions
1. How exchange of gases takes place in alveoli?