Punjab 12th Class Biology Respiration Mcqs Test Online

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Biology

1. 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, 6, 5

3.4, 1, 3, 2, 5, 6

4.1, 4, 3, 2, 6, 5

2. 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 muscular system

3.The excretory system

4.The skin

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

1.Trachea

2.Bronchi

3.Larynx

4.Alveoli

4. 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 partial pressure of carbon dioxide in the alveolar air

3.Holding the breath

4.A decrease in the pulmonary circulation

5. 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

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

1.Dissolved in plasma

2.As bicarbonate

3.Dissolved in water

4.Bound to hemoglobin

7. Respiratory pigments:

1.All have four haem groups

2.Attach to the alveolar wall

3.Combine reversibly with only oxygen

4.None of these

8. Breathing is an example of

1.Diffusion

2.Counter current exchange

3.Ventilation

4.Cellular respiration

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

1.More dome like shape of diaphragm

2.Contraction of diaphragm

3.Backward and downward movement of rib cage

4.Relaxation of external intercostal muscles

10. When you inhale, the diaphragm?

1.Relaxes and moves downward

2.Contracts and moves downward

3.Relaxes and moves upward

4.Contracts and moves upward

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

1.A lack of oxygen in the blood

2.An excess of carbon dioxide in the lungs

3.An excess of carbon dioxide in the blood

4.A lack of oxygen in the tissues

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

1.Carbonate ions

2.Bicarbonate ions

3.Hydrogen ions

4.Hydroxyl ions

13. Pulmonary emphysema:

1.Is uncommon in cigarette smokers

2.Results from bronchial constriction

3.Characterized by loss of elasticity of the alveolar walls

4.Results from bacterial infection

14. 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

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