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Q. No.Each haemoglobin molecule can carry a maximum of:
1. four atoms of oxygen
2. two molecules of oxygen
3. four molecules of oxygen
4. one atom of oxygen
Subtopic: Â Respiratory System: Transport of Gases |
 83%
From NCERT
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The diffusion membrane in the human lungs has a cumulative thickness of:
1. less than I mm
2. approximately 2 mm to 5 mm
3. more than 10 mm
4. a range between 10 mm and 20 mm
1. less than I mm
2. approximately 2 mm to 5 mm
3. more than 10 mm
4. a range between 10 mm and 20 mm
Subtopic: Â Respiratory System: Exchange of Gases |
 94%
From NCERT
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Suppose at a higher altitude, the atmospheric pressure is measured to be 500 mm Hg. What would be the expected partial pressure of oxygen approximately at this altitude [assume a similar composition as the air at sea level]?
1. 100 mm Hg
2. 125 mm Hg
3. 75 mm Hg
4. 159 mm Hg
1. 100 mm Hg
2. 125 mm Hg
3. 75 mm Hg
4. 159 mm Hg
Subtopic: Â Respiratory System: Exchange of Gases |
 55%
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What is the primary function of the epiglottis?
1. To produce sound
2. To filter dust and other particles from inhaled air
3. To prevent food from entering the trachea
4. To humidify and warm the inhaled air
1. To produce sound
2. To filter dust and other particles from inhaled air
3. To prevent food from entering the trachea
4. To humidify and warm the inhaled air
Subtopic: Â Respiratory System: Trachea & Basic Anatomy of Lung |
 98%
From NCERT
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Where is the pneumotaxic center located in the human brain?
1. Medulla oblongata
2. Hypothalamus
3. Cerebrum
4. Pons
1. Medulla oblongata
2. Hypothalamus
3. Cerebrum
4. Pons
Subtopic: Â Respiratory System: Regulation of Respiration |
 94%
From NCERT
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From the given statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | About 97 per cent of O2 is transported by RBCs in the blood. |
| II: | Nearly 20-25 per cent of CO2 is transported by RBCs. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Â Respiratory System: Transport of Gases |
 92%
From NCERT
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Match the following locations with their typical partial pressure of oxygen (pO2):
Codes:
| Column I | Column II | ||
| A | Alveoli | P | 104 mm Hg |
| B | Arterial Blood | Q | 40 mm Hg |
| C | Venous Blood | R | 95 mm Hg |
| D | Atmospheric Air | S | 159 mm Hg |
| A | B | C | D | |
| 1. | R | P | S | Q |
| 2. | P | R | Q | S |
| 3. | P | Q | R | S |
| 4. | Q | P | S | R |
Subtopic: Â Respiratory System: Exchange of Gases |
 85%
From NCERT
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Residual volume in lungs:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Prevents Lung Collapse |
| II: | Facilitates Gas Exchange |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Â Respiratory System: Pulmonary Volumes & Capacities |
From NCERT
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Consider the given two statements:
| Statement I: | The primary drive for breathing at rest is the concentration of oxygen in the blood rather than the concentration of carbon dioxide. |
| Statement II: | Carbon dioxide and hydrogen ion concentration have no effect on central chemoreceptors in the brain. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Â Respiratory System: Exchange of Gases |
 65%
From NCERT
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Identify the incorrect statement:
| 1. | Our lungs remove 5 mL carbon dioxide per minute per 100 mL of blood |
| 2. | On an average, 25 to 30 grams of urea is excreted out per day |
| 3. | An adult human excretes on an average 1 to 1.5 liters of urine per day |
| 4. | Approximately 1 million nephrons are present in each kidney |
Subtopic: Â Respiratory System: Transport of Gases |
 92%
From NCERT
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