Punjab 12th Class Biology Respiration Mcqs Test Online

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Biology

1. 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

2. Pulmonary emphysema:

1.Results from bronchial constriction

2.Results from bacterial infection

3.Is uncommon in cigarette smokers

4.Characterized by loss of elasticity of the alveolar walls

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

1.1, 4, 3, 2, 6, 5

2.4, 1, 3, 2, 6, 5

3.4, 1, 3, 2, 5, 6

4.1, 4, 3, 2, 5, 6

4. Respiratory pigments:

1.Combine reversibly with only oxygen

2.None of these

3.All have four haem groups

4.Attach to the alveolar wall

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

1.Bicarbonate ions

2.Carbonate ions

3.Hydroxyl ions

4.Hydrogen ions

6. 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.An excess of carbon dioxide in the blood

3.A lack of oxygen in the blood

4.An excess of carbon dioxide in the lungs

7. 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.Tidal volume

4.Viral capacity

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

1.Trachea

2.Alveoli

3.Larynx

4.Bronchi

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

1.Contraction of diaphragm

2.More dome like shape of diaphragm

3.Backward and downward movement of rib cage

4.Relaxation of external intercostal muscles

10. 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

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

1.Dissolved in water

2.Bound to hemoglobin

3.As bicarbonate

4.Dissolved in plasma

12. 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

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

1.Ribs, intercostals muscles

2.Ribs

3.Ribs, intercostals muscles and diaphragm

4.Intercostals muscles

14. Breathing is an example of

1.Cellular respiration

2.Diffusion

3.Ventilation

4.Counter current exchange

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