Q. No.Select the last step involved in respiration
| 1. | Diffusion of gases |
| 2. | Breathing |
| 3. | Utilisation of \(O_2\) by body cells and resultant release of \(CO_2\) |
| 4. | Transport of gases |
Subtopic: Respiratory System: Exchange of Gases | Respiratory System: Regulation of Respiration |
87%
Level 1: 80%+
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| Assertion (A): | The value of tidal volume in a healthy human is about 6000-8000 mL/min. |
| Reason (R): | The volume of air remaining in the lungs even after forcible expiration is 1100-1200 mL. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Respiratory System: Pulmonary Volumes & Capacities | Respiratory System: Exchange of Gases |
79%
Level 2: 60%+
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Diffusion membrane consists of
| 1. | Squamous epithelium of alveoli |
| 2. | endothelium of alveolar capillaries |
| 3. | Basement substance between them |
| 4. | All of the above |
Subtopic: Respiratory System: Exchange of Gases |
97%
Level 1: 80%+
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Partial pressure for oxygen and \(CO_2\) is represented as
1. \(pO\) and \(pCO\)
2. \(P_o \text {and}~ P_{CO_2}\)
3. \(pO_2 ~\text {and} ~pCO_2\)
4. \(O_2p ~\text {and} ~CO_2p\)
1. \(pO\) and \(pCO\)
2. \(P_o \text {and}~ P_{CO_2}\)
3. \(pO_2 ~\text {and} ~pCO_2\)
4. \(O_2p ~\text {and} ~CO_2p\)
Subtopic: Respiratory System: Exchange of Gases |
95%
Level 1: 80%+
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What is the value of \(pO_2\) in alveoli and tissues respectively?
| 1. | 104 mm Hg and 150 mm Hg |
| 2. | 45 mm Hg and 0.3 mm Hg |
| 3. | 104 mm Hg and 40 mm Hg |
| 4. | 95 mm Hg and 159 mm Hg |
Subtopic: Respiratory System: Exchange of Gases |
91%
Level 1: 80%+
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Which of the following best explains why CO₂ diffuses more easily across the respiratory membrane than O₂?
.
| 1. | CO₂ is more abundant in the atmosphere than O₂. |
| 2. | CO₂ has higher solubility than O₂. |
| 3. | CO₂ has a smaller molecular size than O₂. |
| 4. | CO₂ is present in higher concentrations in the lungs |
Subtopic: Respiratory System: Exchange of Gases |
88%
Level 1: 80%+
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The solubility of carbon dioxide is about ...........times higher than that of oxygen across the respiratory membrane.
| 1. | 20-25 | 2. | 25-50 |
| 3. | 125-150 | 4. | 200-250 |
Subtopic: Respiratory System: Exchange of Gases |
91%
Level 1: 80%+
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Alveoli are the primary sites of exchange of gases \(O_2\) and \(CO_2\) are exchanged in these sites by simple diffusion which is mainly based on
| 1. | Pressure concentration which is mainly based on |
| 2. | Solubility of gases |
| 3. | Thickness of membranes |
| 4. | All of these |
Subtopic: Respiratory System: Exchange of Gases |
95%
Level 1: 80%+
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What is the value of \(pCO_2 \) in atmospheric air, alveoli and tissues respectively?
| 1. | 0.3 mm Hg, 40 mm Hg and 95 mm Hg |
| 2. | 95 mm Hg, 40 mm Hg and 159 mm Hg |
| 3. | 45 mm Hg, 0.3 mm Hg and 40mm Hg |
| 4. | 0.3 mm Hg, 40 mm Hg and 45 mm Hg |
Subtopic: Respiratory System: Exchange of Gases |
84%
Level 1: 80%+
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Transport of gases in alveoli takes place by :
| 1. | Active transport | 2. | Passive transport |
| 3. | Simple diffusion | 4. | None |
Subtopic: Respiratory System: Exchange of Gases |
86%
Level 1: 80%+
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