Q. No.Asthma may be attributed to?
1. allergic reaction of the mast cells in the lungs
2. inflammation of the trachea
3. accumulation of fluid in the lungs
4. bacterial infection of the lungs
2. inflammation of the trachea
3. accumulation of fluid in the lungs
4. bacterial infection of the lungs
The maximum amount of air that a person can breathe out after a forced inspiration, under normal physiological conditions, would be about:
| 1. | 1600 ml | 2. | 2300 ml |
| 3. | 4500 ml | 4. | 5600 ml |
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Phonation is the function of:
| 1. | Larynx | 2. | Pharynx |
| 3. | Muscles of lips and tongue | 4. | Sinuses in the bones |
Consider the following statements:
| I: | The thoracic chamber is anatomically an air tight chamber. |
| II: | Any change in the volume of the thoracic cavity will be reflected in the pulmonary cavity. |
1. Both I and II are correct and II explains I
2. Both I and II are correct and I explains II
3. Both I and II are correct but II does not explain I
4. Both I and II are incorrect
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Under normal resting conditions, almost all respiratory effort is due to:
1. contraction and relaxation of diaphragm
2. elevation of rib cage
3. depression of rib cage
4. contraction of abdominal muscles
What prevents the entry of food into the larynx during deglutition?
1. A thin elastic cartilaginous flap
2. A thick fibrous cartilaginous flap
3. A thick elastic cartilaginous flap
4. A thin calcified cartilaginous flap
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Particles that are less than 2.5 μm in diameter are the most dangerous for the pathogenesis of occupational lung disease. |
| Reason (R): | The particles of this size move into and out of alveoli, often without substantial deposition and injury. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Oxygen binding to haemoglobin in blood is
| 1. | directly proportional to the concentration of CO2 in the medium |
| 2. | inversely proportional to the concentration of CO2 in the medium |
| 3. | directly proportional to the concentration of CO in the medium |
| 4. | independent of the concentration of CO in the medium |
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Which one of the following statements is incorrect?
1. The residual air in lungs slightly decreases the efficiency of respiration in mammals
2. The presence of non-respiratory air sacs increases the efficiency of respiration in birds
3. In insects, circulating body fluids serve to distribute oxygen to tissues
4. The principle of counter current flow facilitates efficient respiration in gills of fishes
People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metres have around 8 million. This is because at high altitude:
1. people get pollution-free air to breathe and more oxygen is available
2. atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive
3. there is more UV radiation which enhances RBC production
4. people eat more nutritive food, therefore more RBCs are formed
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