Q. No.The conducting part of the human respiratory system is not involved in:
I. clearing inhaled air from foreign particles
II. humidifying the exhaled air
III. bringing the air to a temperature higher than body temperature
1. Only I
2. Only II and III
3. Only I and II
4. I, II and III
I. clearing inhaled air from foreign particles
II. humidifying the exhaled air
III. bringing the air to a temperature higher than body temperature
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It is necessary that lungs must be present in anatomically air-tight chamber because:
1. we cannot directly alter the pulmonary volume
2. our lungs are not made of any elastic tissue
3. the pleural cavity always has a positive pressure with respect to pulmonary pressure
4. the partial pressure of oxygen in atmosphere is less than that in the alveoli
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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 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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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 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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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 alveoli are lined with:
1. Simple cuboidal epithelium
2. Pseudo-stratified columnar ciliated epithelium
3. Transitional epithelium
4. Simple squamous epithelium
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The binding of carbon dioxide to hemoglobin:
I: is related to the partial pressure of carbon dioxide
II: is affected by the partial pressure of oxygen
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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The oxy-hemoglobin dissociation curve shifts to the right in all the following conditions except:
| 1. Presence of 2,3-DPG | 2. Increased temperature |
| 3. Increased pH | 4. Increased carbon dioxide |
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