Punjab 12th Class Biology Respiration Mcqs Test Online

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Biology

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

1.Larynx

2.Alveoli

3.Bronchi

4.Trachea

2. 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

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

1.Vital volume

2.Residual capacity

3.Viral capacity

4.Tidal volume

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

1.4, 1, 3, 2, 5, 6

2.4, 1, 3, 2, 6, 5

3.1, 4, 3, 2, 5, 6

4.1, 4, 3, 2, 6, 5

5. Pulmonary emphysema:

1.Results from bronchial constriction

2.Characterized by loss of elasticity of the alveolar walls

3.Results from bacterial infection

4.Is uncommon in cigarette smokers

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

1.Hydrogen ions

2.Hydroxyl ions

3.Bicarbonate ions

4.Carbonate ions

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

1.Contraction of diaphragm

2.Backward and downward movement of rib cage

3.Relaxation of external intercostal muscles

4.More dome like shape of diaphragm

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

1.The excretory system

2.The muscular system

3.The circulatory system

4.The skin

9. Breathing is an example of

1.Ventilation

2.Diffusion

3.Counter current exchange

4.Cellular respiration

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

1.Intercostals muscles

2.Ribs, intercostals muscles and diaphragm

3.Ribs

4.Ribs, intercostals muscles

11. Respiratory pigments:

1.None of these

2.Attach to the alveolar wall

3.All have four haem groups

4.Combine reversibly with only oxygen

12. When you inhale, the diaphragm?

1.Relaxes and moves upward

2.Contracts and moves upward

3.Contracts and moves downward

4.Relaxes and moves downward

13. 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.A lack of oxygen in the tissues

3.An excess of carbon dioxide in the blood

4.A lack of oxygen in the blood

14. 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.Holding the breath

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

4.A decrease in the pulmonary circulation

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