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.Trachea

2.Bronchi

3.Alveoli

4.Larynx

2. Respiratory pigments:

1.Attach to the alveolar wall

2.None of these

3.All have four haem groups

4.Combine reversibly with only oxygen

3. 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, 6, 5

3.4, 1, 3, 2, 6, 5

4.1, 4, 3, 2, 5, 6

4. 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

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

1.Ribs

2.Ribs, intercostals muscles

3.Intercostals muscles

4.Ribs, intercostals muscles and diaphragm

6. When you inhale, the diaphragm?

1.Relaxes and moves downward

2.Contracts and moves downward

3.Contracts and moves upward

4.Relaxes and moves upward

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

1.Dissolved in water

2.Bound to hemoglobin

3.Dissolved in plasma

4.As bicarbonate

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

1.Tidal volume

2.Residual capacity

3.Vital volume

4.Viral capacity

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

1.Relaxation of external intercostal muscles

2.Backward and downward movement of rib cage

3.More dome like shape of diaphragm

4.Contraction of diaphragm

10. 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

11. Breathing is an example of

1.Cellular respiration

2.Counter current exchange

3.Diffusion

4.Ventilation

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

1.Hydroxyl ions

2.Hydrogen ions

3.Carbonate ions

4.Bicarbonate ions

13. 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 skin

3.The circulatory system

4.The muscular system

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

3.Holding the breath

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

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