Q. No.The alveoli are lined with:
1. Simple cuboidal epithelium
2. Pseudo-stratified columnar ciliated epithelium
3. Transitional epithelium
4. Simple squamous epithelium
1. Simple cuboidal epithelium
2. Pseudo-stratified columnar ciliated epithelium
3. Transitional epithelium
4. Simple squamous epithelium
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Under normal physiological conditions, the maximum volume of air a person can breathe out after a forced inspiration in a healthy human being is about:
| 1. | 2300 ml | 2. | 3500 ml |
| 3. | 4600 ml | 4. | 5800 ml |
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Branchial respiration is seen in all the following except:
| 1. Aquatic arthropods | 2. Fishes |
| 3. Amphibians like frog | 4. Aquatic mollusks |
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The volume of thoracic chamber in the antero-posterior axis can be increased by:
1. Contraction of diaphragm
2. Relaxation of diaphragm
3. Contraction of external intercostals
4. Contraction of internal intercostals
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The partial pressure of oxygen in oxygenated blood is about:
| 1. 104 mmHg | 2. 100 mmHg |
| 3. 95 mmHg | 4. 40 mmHg |
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Which of the following equations regarding the calculation of pulmonary capacities would be correct?
| 1. IC = IRV – TV | 2. EC = VC – IRV |
| 3. VC = ERV + IRV | 4. TLC = VC – RV |
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The formation of oxy-hemoglobin at the alveoli is favored by all the following except:
| 1. High pO2 | 2. Low pCO2 |
| 3. Lower H+ ion concentration | 4. Higher temperature |
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The sum of expiratory reserve volume [ERV] and residual volume [RV] corresponds to:
| 1. Expiratory capacity | 2. Vital capacity |
| 3. Functional residual capacity | 4. Total lung capacity |
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The major mode of transport of carbon dioxide in human body is:
| 1. | in combination with hemoglobin |
| 2. | in dissolved state in plasma |
| 3. | as carboxyhemoglobin |
| 4. | as bicarbonate |
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The duration of inspiration can be reduced by:
| 1. | an increase of carbon dioxide in blood |
| 2. | a chemical signal from aortic and carotid bodies |
| 3. | a neural signal from pneumotaxic center |
| 4. | an increase in hydrogen ion concentration in CSF |
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