Punjab 12th Class Biology Respiration Mcqs Test Online

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Biology

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

1.Viral capacity

2.Tidal volume

3.Vital volume

4.Residual capacity

2. Breathing is an example of

1.Cellular respiration

2.Ventilation

3.Counter current exchange

4.Diffusion

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

1.Hydroxyl ions

2.Bicarbonate ions

3.Carbonate ions

4.Hydrogen ions

4. 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

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

1.An excess of carbon dioxide in the blood

2.An excess of carbon dioxide in the lungs

3.A lack of oxygen in the blood

4.A lack of oxygen in the tissues

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

1.The skin

2.The muscular system

3.The circulatory system

4.The excretory system

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

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

2.A decrease in the pulmonary circulation

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

4.Holding the breath

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

1.Bronchi

2.Alveoli

3.Trachea

4.Larynx

10. Pulmonary emphysema:

1.Results from bronchial constriction

2.Characterized by loss of elasticity of the alveolar walls

3.Is uncommon in cigarette smokers

4.Results from bacterial infection

11. Respiratory pigments:

1.All have four haem groups

2.None of these

3.Attach to the alveolar wall

4.Combine reversibly with only oxygen

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

1.Dissolved in plasma

2.As bicarbonate

3.Bound to hemoglobin

4.Dissolved in water

13. When you inhale, the diaphragm?

1.Relaxes and moves upward

2.Relaxes and moves downward

3.Contracts and moves downward

4.Contracts and moves upward

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

1.Ribs, intercostals muscles

2.Ribs

3.Intercostals muscles

4.Ribs, intercostals muscles and diaphragm

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