The amount of carbon dioxide that can diffuse through the diffusion membrane is much higher compared to that of oxygen because:

1.	the gradient across the membrane is much higher for carbon dioxide
2.	carbon dioxide is more toxic than oxygen
3.	solubility of carbon dioxide is much higher than that of oxygen
4.	carbon dioxide has more affinity for hemoglobin than that of oxygen

The functions of the respiratory rhythm center can be moderated by a center located in:

Damage to alveolar walls leading to decrease in respiratory surface is characteristic of:
1. Asthma
2. Pneumoconiosis
3. Emphysema
4. Pneumonitis

The value of which of the following is normally the highest in normal physiological conditions?

What amount of carbon dioxide is delivered by every 100 ml of deoxygenated blood at the alveoli under normal physiological conditions?

Approximately what amount of oxygen is carried in a dissolved state through the plasma by 100 ml of oxygenated blood?
1. 0.6 ml
2. 1.4 ml
3. 4 ml
4. 5 ml

The oxy-hemoglobin dissociation curve shifts to the right in all the following conditions except:

The binding of carbon dioxide to hemoglobin:
I: is related to the partial pressure of carbon dioxide
II: is affected by the partial pressure of oxygen
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect

The alveoli are lined with:
1. Simple cuboidal epithelium
2. Pseudo-stratified columnar ciliated epithelium
3. Transitional epithelium
4. Simple squamous epithelium

Pulmonary fibrosis is the feature of all cases of:
1. Occupational respiratory disorders
2. Emphysema
3. Pneumonia
4. Bronchial asthma