Punjab 12th Class Biology Respiration Mcqs Test Online

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Biology

1. Which sequence most accurately describes the sequence of airflow in the human respiratory system? 1. Pharynx 2. Bronchus 3. Trachea 4. Larynx 5. Alveolus 6. Bronchiole

1.4, 1, 3, 2, 5, 6

2.4, 1, 3, 2, 6, 5

3.1, 4, 3, 2, 6, 5

4.1, 4, 3, 2, 5, 6

2. Which of the following changes will increase the body’s rate of carbon dioxide excretion into the alveoli?

1.A decrease in the pulmonary circulation

2.Holding the breath

3.A decrease in the partial pressure of carbon dioxide in the alveolar air

4.The breakdown of alveolar tissue as a result of disease

3. Breathing is an example of

1.Diffusion

2.Cellular respiration

3.Counter current exchange

4.Ventilation

4. Respiratory pigments:

1.Combine reversibly with only oxygen

2.None of these

3.All have four haem groups

4.Attach to the alveolar wall

5. Which event is not associated with the activity of expiration?

1.Relaxation of external intercostal muscles

2.More dome like shape of diaphragm

3.Contraction of diaphragm

4.Backward and downward movement of rib cage

6. When you inhale, the diaphragm?

1.Contracts and moves downward

2.Relaxes and moves upward

3.Relaxes and moves downward

4.Contracts and moves upward

7. Which of the following factors is the most effective in accelerating the rate of breathing in man?

1.A lack of oxygen in the blood

2.A lack of oxygen in the tissues

3.An excess of carbon dioxide in the blood

4.An excess of carbon dioxide in the lungs

8. With which other system do specialize respiratory systems most closely interface in exchanging gases between the cells and the environment?

1.The circulatory system

2.The skin

3.The excretory system

4.The muscular system

9. How is most of the oxygen transported in the blood?

1.As bicarbonate

2.Bound to hemoglobin

3.Dissolved in plasma

4.Dissolved in water

10. Which of the following is the respiratory surface in human respiratory system?

1.Larynx

2.Bronchi

3.Alveoli

4.Trachea

11. Pulmonary emphysema:

1.Results from bacterial infection

2.Characterized by loss of elasticity of the alveolar walls

3.Is uncommon in cigarette smokers

4.Results from bronchial constriction

12. When blood leaves the capillary bed most of the carbon dioxide is in the form of:

1.Carbonate ions

2.Bicarbonate ions

3.Hydrogen ions

4.Hydroxyl ions

13. The amount of air moved in and out of the lungs with each normal resting breath is the:

1.Tidal volume

2.Viral capacity

3.Residual capacity

4.Vital volume

14. The lateral walls of the chest cavity of man are composed of the:

1.Ribs, intercostals muscles and diaphragm

2.Ribs

3.Intercostals muscles

4.Ribs, intercostals muscles

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