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Q. No.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.
Subtopic: Â Respiratory System: Exchange of Gases |
 88%
Level 1: 80%+
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The trachea divides into a right and a left primary bronchus at the level of:
1. 2nd thoracic vertebra
2. 3rd thoracic vertebra
3. 5th thoracic vertebra
4. 12th thoracic vertebra
1. 2nd thoracic vertebra
2. 3rd thoracic vertebra
3. 5th thoracic vertebra
4. 12th thoracic vertebra
Subtopic: Â Respiratory System: Trachea & Basic Anatomy of Lung |
 94%
Level 1: 80%+
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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 |
Subtopic: Â Respiratory System: Pulmonary Volumes & Capacities |
 70%
Level 2: 60%+
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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 |
Subtopic: Â Respiratory System: Transport of Gases |
 87%
Level 1: 80%+
Hints
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 |
Subtopic: Â Respiratory System: Transport of Gases |
 70%
Level 2: 60%+
Hints
Pulmonary fibrosis is a pathological hallmark of:
| 1. | Chronic obstructive lung disease |
| 2. | Bronchial asthma |
| 3. | Viral Pneumonia in children |
| 4. | Occupational lung diseases |
Subtopic: Â Respiratory Disorders: Part 1 |
 87%
Level 1: 80%+
Hints
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 |
Subtopic: Â Respiratory System: Exchange of Gases |
 84%
Level 1: 80%+
Hints
Both carbon dioxide and oxygen move across the respiratory membrane due to:
| 1. | gravity | 2. | blood pressure |
| 3. | diffusion | 4. | active transport |
Subtopic: Â Respiratory System: Exchange of Gases |
 87%
Level 1: 80%+
Hints
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 |
Subtopic: Â Respiratory System: Regulation of Respiration |
 79%
Level 2: 60%+
Hints
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 |
Subtopic: Â Respiratory System: Regulation of Respiration |
 63%
Level 2: 60%+
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