Which of the following is higher in value?

1.	Amount of carbon dioxide delivered by 100 ml of blood at lungs than amount of oxygen delivered by 100 ml of blood at tissues
2.	Amount of carbon dioxide transported by hemoglobin than amount of oxygen transported by hemoglobin
3.	The diffusing capacity of carbon dioxide across the respiratory membrane than the diffusing capacity of oxygen across the respiratory membrane
4.	Alveolar ventilation than the minute ventilation

The value of partial pressure of oxygen in alveolar air is:
1. less than that in oxygenated blood
2. more than that in atmospheric air
3. equal to that in oxygenated blood
4. more than that in tissues

The graph below shows tracing of pulmonary volumes during spirometery of a person. Identify A, B, C and D respectively:

1. IRV, TV, ERV and RV
2. IRV, TV, RV and ERV
3. ERV, TV, IRV and RV
4. ERV, IRV, RV and TV

The trachea divides into a right and a left primary bronchi at the level of:
1. 3^rd thoracic vertebra
2. 5^th thoracic vertebra
3. 7^th thoracic vertebra
4. 12^th thoracic vertebra

Incomplete cartilaginous rings are seen in the walls of all the following except:

The peripheral chemoreceptors for regulation of respiration are located:
1. adjacent to the rhythm center
2. near arch of aorta and carotid artery
3. in the walls of trachea
4. in the walls of the alveoli

When carbon dioxide combines with haemoglobin in blood, it forms:
1. Carboxyhemoglobin
2. Carbaminohemoglobin
3. Methemoglobin
4. Oxidized hemoglobin

Which of the following has the highest affinity for oxygen?
1. HbS
2. HbA
3. HbF
4. Methemoglobin

Which of the given three layers in the respiratory membrane is/are one-celled thick?

Which occupational lung disorder can lead to cancer of lung?
1. Silicosis
2. Byssinosis
3. Bagassosis
4. Asbestosis