What is the partial pressure of oxygen and carbon dioxide respectively in the venous blood leaving the tissues [in mm of Hg]?
1. 104, 40 | 2. 95, 40 |
3. 40, 45 | 4. 20, 46 |
A minimal amount of pleural fluid present in the pleural cavity:
1. | provides a medium for the exchange of respiratory gases |
2. | reduces friction between the visceral and parietal pleurae |
3. | provides lubrication for movements of the diaphragm |
4. | permits the exchange of electrolytes during respiration |
When the diaphragm or external intercostal muscles contract, intrapulmonary pressure should
1. | increase | 2. | decrease |
3. | remain constant | 4. | equal atmospheric pressure |
Air conditioning – warming, humidifying and filtering of the air, is the function performed by:
1. | oral cavity | 2. | nasal cavity |
3. | pharynx | 4. | larynx |
During deglutition, the food is prevented from entering into the larynx by the cartilaginous:
1. epiglottis | 2. glottis |
3. aryepiglottic fold | 4. laryngeal prominence |
What is true about RBCs in humans?
1. | They carry about 20-25 percent of |
2. | They transport 99.5 percent of |
3. | They transport about 80 percent oxygen only and the rest 20 percent of it is transported in a dissolved state in blood plasma |
4. | They do not carry at all |
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 |
Most of the aquatic arthropods respire through:
1. diffusion over entire body surface | 2. gills |
3. tracheae and tracheoles | 4. skin |
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
Consider the following two statements:
I: | The lungs are situated in the thoracic chamber which is anatomically an air-tight chamber. |
II: | This arrangement is essential as we cannot directly alter the thoracic volume. |
1. | Both I and II are correct and II correctly explains I |
2. | Both I and II are correct but II does not explain I |
3. | I is correct and II is incorrect |
4. | Both I and II are incorrect |