Punjab 12th Class Biology Respiration Mcqs Test Online

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Biology

1. Pulmonary emphysema:

1.Results from bacterial infection

2.Characterized by loss of elasticity of the alveolar walls

3.Results from bronchial constriction

4.Is uncommon in cigarette smokers

2. When you inhale, the diaphragm?

1.Contracts and moves downward

2.Relaxes and moves downward

3.Relaxes and moves upward

4.Contracts and moves upward

3. 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.A lack of oxygen in the tissues

3.A lack of oxygen in the blood

4.An excess of carbon dioxide in the lungs

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

1.Ribs

2.Intercostals muscles

3.Ribs, intercostals muscles

4.Ribs, intercostals muscles and diaphragm

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

1.Carbonate ions

2.Hydroxyl ions

3.Hydrogen ions

4.Bicarbonate ions

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

1.Relaxation of external intercostal muscles

2.Contraction of diaphragm

3.More dome like shape of diaphragm

4.Backward and downward movement of rib cage

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

1.Alveoli

2.Trachea

3.Larynx

4.Bronchi

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

1.As bicarbonate

2.Dissolved in water

3.Dissolved in plasma

4.Bound to hemoglobin

9. Respiratory pigments:

1.Combine reversibly with only oxygen

2.None of these

3.All have four haem groups

4.Attach to the alveolar wall

10. 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, 6, 5

2.1, 4, 3, 2, 5, 6

3.4, 1, 3, 2, 5, 6

4.1, 4, 3, 2, 6, 5

11. Breathing is an example of

1.Cellular respiration

2.Diffusion

3.Ventilation

4.Counter current exchange

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

4.Holding the breath

13. 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

14. 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 muscular system

4.The excretory system

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