Punjab 12th Class Biology Respiration Mcqs Test Online

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Biology

1. Respiratory pigments:

1.Attach to the alveolar wall

2.All have four haem groups

3.None of these

4.Combine reversibly with only oxygen

2. 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

1.1, 4, 3, 2, 5, 6

2.4, 1, 3, 2, 5, 6

3.4, 1, 3, 2, 6, 5

4.1, 4, 3, 2, 6, 5

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

1.A lack of oxygen in the tissues

2.A lack of oxygen in the blood

3.An excess of carbon dioxide in the lungs

4.An excess of carbon dioxide in the blood

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

1.Bicarbonate ions

2.Carbonate ions

3.Hydrogen ions

4.Hydroxyl ions

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

1.Vital volume

2.Tidal volume

3.Residual capacity

4.Viral capacity

6. 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

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

1.Ribs, intercostals muscles

2.Ribs

3.Ribs, intercostals muscles and diaphragm

4.Intercostals muscles

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. Pulmonary emphysema:

1.Results from bronchial constriction

2.Is uncommon in cigarette smokers

3.Characterized by loss of elasticity of the alveolar walls

4.Results from bacterial infection

10. When you inhale, the diaphragm?

1.Relaxes and moves downward

2.Relaxes and moves upward

3.Contracts and moves downward

4.Contracts and moves upward

11. Breathing is an example of

1.Counter current exchange

2.Diffusion

3.Ventilation

4.Cellular respiration

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

1.Trachea

2.Larynx

3.Bronchi

4.Alveoli

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

1.Dissolved in water

2.Dissolved in plasma

3.As bicarbonate

4.Bound to hemoglobin

14. 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

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