The exchange of gases in the alveoli of the lungs takes place by:

1. osmosis

2. simple diffusion

3. passive transport

4. active transport

Dead space air in man is:

1. 500 mL

2. 150 mL

3. 250 mL

4. 1.5 L

Amount of CO₂ in expired air is about:

1. 0.04%

2. 0.03%

3. 4.5%

4. 21%

What is another name for the windpipe?

1. Trachea

2. Larynx

3. Oesophagus

4. Lungs

The effect of cigarette smoking and radon in combination on lungs is:

1. Fatal

2. Synergistic

3. Mutualistic

4. Antagonistic

 What is another name for the windpipe?

1.  Trachea

2.  Larynx

3. Oesophagus

4.  Lungs

Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?

1. 2700 mL

2. 1500 mL

3. 1700 mL

4. 2200 mL

Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to:

The efficiency of a respiratory system would be increased by all the following except:
1. increase the surface area available for diffusion of gases
2. decrease the distance over which the gases must diffuse
3. increase the concentration differences of gases inside and outside the system
4. dry the system out so the gases do not have to diffuse through water

How many of the statements given below are correct?
I. During inspiration the diaphragm moves upward while the thorax expands and moves outward.
II. The anatomical dead space represents the air that is trapped in the alveoli and is around 150mL.
III. Decreasing blood oxygen and increasing carbon dioxide cause the major increases seen in breathing rate during strenuous exercise.
IV. Oxygen dissociates faster from hemoglobin during exercise.
V. Increased pH shifts oxyHb-dissociation curve to the right.
1. 2

2. 3

3. 4

4. 5