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Q. No.In a healthy human, under normal physiological conditions the partial pressure of oxygen in systemic [oxygenated blood] circulation is:
1. about 104 mm Hg
2. about 40 mm Hg
3. about 95 mm Hg
4. about 159 mm Hg
Subtopic: Respiratory System: Exchange of Gases |
83%
From NCERT
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Which of the following statements is not correct?
| 1. | Every 100 ml of oxygenated blood can deliver around 5 ml of oxygen to the tissue under normal physiological conditions. |
| 2. | Oxygen gas has most potent effect on the central chemoreceptors and plays most vital role in regulation of respiration |
| 3. | Nearly 70 percent of carbon dioxide is carried as bicarbonate in the blood. |
| 4. | Every 100 ml of deoxygenated blood delivers about 4 ml of carbon dioxide to the alveoli. |
Subtopic: Respiratory System: Regulation of Respiration |
87%
From NCERT
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Inspiration during breathing occurs when the pressure in lungs is:
1. Zero
2. Negative with respect to atmospheric pressure
3. Equal to atmospheric pressure
4. Positive with respect to atmospheric pressure
1. Zero
2. Negative with respect to atmospheric pressure
3. Equal to atmospheric pressure
4. Positive with respect to atmospheric pressure
Subtopic: Respiratory System: Pulmonary Ventilation |
94%
From NCERT
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In the diffusion membrane in human lungs, a basement membrane supports:
| I. Alveolar epithelium | II. Vascular endothelium |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Respiratory System: Exchange of Gases |
71%
From NCERT
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Under normal physiological conditions, what percent of haemoglobin is saturated with oxygen when the partial pressure of oxygen is 40 mm Hg?
1. 50
2. 75
3. 90
4. 98
1. 50
2. 75
3. 90
4. 98
Subtopic: Respiratory System: Transport of Gases |
58%
From NCERT
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Contraction of diaphragm and contraction of external intercostals:
| 1. | decrease the intrapulmonary pressure and lead to inhalation |
| 2. | increase the intrapulmonary pressure and lead to inhalation |
| 3. | decrease the intrapulmonary pressure and lead to exhalation |
| 4. | increase the intrapulmonary pressure and lead to exhalation |
Subtopic: Respiratory System: Pulmonary Ventilation |
78%
From NCERT
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Which of the following values for the given parameter is incorrect?
| 1. | Partial pressure of oxygen in alveolar air | 104 mm Hg |
| 2. | Partial pressure of carbon dioxide in deoxygenated blood | 45 mm Hg |
| 3. | Transport of carbon dioxide in blood as bicarbonate | 70 % |
| 4. | Transport of carbon dioxide as carbaminohemoglobin | 7 % |
Subtopic: Respiratory System: Transport of Gases |
77%
From NCERT
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For each unit difference in the partial pressure across the diffusion membrane, the amount of carbon dioxide that diffuses:
| 1. | is higher than the amount of oxygen as the solubility of carbon dioxide is 20-25 times lower than that of oxygen |
| 2. | is lower than the amount of oxygen as the solubility of carbon dioxide is 20-25 times lower than that of oxygen |
| 3. | is higher than the amount of oxygen as the solubility of carbon dioxide is 20-25 times higher than that of oxygen |
| 4. | is lower than the amount of oxygen as the solubility of carbon dioxide is 20-25 times higher than that of oxygen |
Subtopic: Respiratory System: Exchange of Gases |
79%
From NCERT
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Which of the following pulmonary capacities is not correctly matched with its constituent pulmonary volumes?
| 1. | Inspiratory capacity | Tidal volume + Inspiratory reserve volume |
| 2. | Expiratory capacity | Tidal volume + Expiratory reserve volume |
| 3. | Functional residual capacity | Residual volume + Inspiratory reserve volume |
| 4. | Vital capacity | Tidal volume + Inspiratory reserve volume + Expiratory reserve volume |
Subtopic: Respiratory System: Pulmonary Volumes & Capacities |
90%
From NCERT
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In breathing:
| 1. | Contraction of internal costal muscles leads to inhalation |
| 2. | Contraction of diaphragm increases the volume of thoracic chamber in dorso-ventral axis |
| 3. | Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure |
| 4. | The residual volume of the lungs averages 2500 ml to 3000 ml |
Subtopic: Respiratory System: Pulmonary Ventilation |
82%
From NCERT
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