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Punjab 12th Class Biology Respiration Mcqs Test Online

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Biology

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

1.Ribs, intercostals muscles and diaphragm

2.Ribs

3.Ribs, intercostals muscles

4.Intercostals muscles

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

1.Vital volume

2.Viral capacity

3.Residual capacity

4.Tidal volume

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

1.Contraction of diaphragm

2.More dome like shape of diaphragm

3.Relaxation of external intercostal muscles

4.Backward and downward movement of rib cage

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

1.Dissolved in plasma

2.Dissolved in water

3.Bound to hemoglobin

4.As bicarbonate

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

1.The muscular system

2.The circulatory system

3.The skin

4.The excretory system

6. Breathing is an example of

1.Diffusion

2.Cellular respiration

3.Ventilation

4.Counter current exchange

7. Respiratory pigments:

1.Attach to the alveolar wall

2.All have four haem groups

3.Combine reversibly with only oxygen

4.None of these

8. 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 lungs

2.An excess of carbon dioxide in the blood

3.A lack of oxygen in the blood

4.A lack of oxygen in the tissues

9. When you inhale, the diaphragm?

1.Relaxes and moves downward

2.Relaxes and moves upward

3.Contracts and moves upward

4.Contracts and moves downward

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

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

2.A decrease in the pulmonary circulation

3.Holding the breath

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

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

1.Alveoli

2.Larynx

3.Bronchi

4.Trachea

12. 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

2.1, 4, 3, 2, 5, 6

3.4, 1, 3, 2, 6, 5

4.1, 4, 3, 2, 6, 5

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

1.Bicarbonate ions

2.Carbonate ions

3.Hydroxyl ions

4.Hydrogen ions

14. Pulmonary emphysema:

1.Results from bacterial infection

2.Results from bronchial constriction

3.Is uncommon in cigarette smokers

4.Characterized by loss of elasticity of the alveolar walls

Test By Subject	Punjab
Test By Topics	12th Class Biology

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