Q. No.Identify the incorrect statement regarding the enzyme carbonic anhydrase:
1.
RBCs contain a very high concentration of this enzyme
2.
The enzyme is absent in the plasma
3.
It facilitates the reaction catalyzed in both directions
4.
It is a metalloenzyme
Pulmonary fibrosis is a pathological hallmark of:
1. Chronic obstructive lung disease
2. Bronchial asthma
3. Viral Pneumonia in children
4. Occupational lung diseases
Under normal physiological conditions, what amount of oxygen is delivered to the tissues?
| 1. | 4 ml | 2. | 5 ml |
| 3. | 15 ml | 4. | 20 ml |
Regarding pulmonary capacities, the maximum volume of air a person can breathe in after a forced expiration can also be defined as:
| 1. | Total volume of air a person can inspire or expire after a normal inspiration or expiration |
| 2. | Volume of air that will remain in the lungs after a normal expiration |
| 3. | Maximum volume of air a person can breathe out after a forced inspiration |
| 4. | Total volume of air accommodated in the lungs at the end of a forced inspiration |
1. 2nd thoracic vertebra
2. 3rd thoracic vertebra
3. 5th thoracic vertebra
4. 12th thoracic vertebra
Alveoli in the lungs are lined by:
1. a simple squamous epithelium.
2. a pseudostratified ciliated columnar epithelium.
3. a simple cuboidal epithelium.
4. a transitional epithelium.
Gas exchange in the human lungs takes place across the respiratory membrane which is made up of:
| 1. | alveolar macrophages and the alveolar cell membrane |
| 2. | alveolar cell membrane and its basement membrane |
| 3. | alveolar cell membrane and capillary membrane |
| 4. | alveolar cell membrane, capillary membrane, and fused basement membranes |
Both carbon dioxide and oxygen move across the respiratory membrane due to:
| 1. | gravity | 2. | blood pressure |
| 3. | diffusion | 4. | active transport |
What will happern to the rate and depth of breathing when blood carbon dioxide rises?
| 1. | decreases | 2. | increases |
| 3. | stays the same | 4. | stops |
The peripheral chemoreceptors in carotid and aortic bodies respond to:
1. hydrogen ion concentration.
2. levels of carbon dioxide in the blood.
3. levels of oxygen in the blood.
4. all of the above
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