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, intercostals muscles

3.Intercostals muscles

4.Ribs

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

1.Relaxation of external intercostal muscles

2.More dome like shape of diaphragm

3.Contraction of diaphragm

4.Backward and downward movement of rib cage

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

1.As bicarbonate

2.Bound to hemoglobin

3.Dissolved in water

4.Dissolved in plasma

4. When you inhale, the diaphragm?

1.Relaxes and moves upward

2.Contracts and moves upward

3.Relaxes and moves downward

4.Contracts and moves downward

5. Respiratory pigments:

1.All have four haem groups

2.None of these

3.Attach to the alveolar wall

4.Combine reversibly with only oxygen

6. Pulmonary emphysema:

1.Results from bacterial infection

2.Is uncommon in cigarette smokers

3.Characterized by loss of elasticity of the alveolar walls

4.Results from bronchial constriction

7. Breathing is an example of

1.Diffusion

2.Ventilation

3.Counter current exchange

4.Cellular respiration

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

1.Larynx

2.Trachea

3.Bronchi

4.Alveoli

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

1.Viral capacity

2.Tidal volume

3.Vital volume

4.Residual capacity

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

1.1, 4, 3, 2, 6, 5

2.4, 1, 3, 2, 6, 5

3.1, 4, 3, 2, 5, 6

4.4, 1, 3, 2, 5, 6

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

1.Holding the breath

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

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

4.A decrease in the pulmonary circulation

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 skin

2.The excretory system

3.The muscular system

4.The circulatory system

14. 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.An excess of carbon dioxide in the lungs

3.A lack of oxygen in the blood

4.A lack of oxygen in the tissues

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