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Q. No.O2 and CO2 are exchanged by simple diffusion:
I:
at alveoli
II:
between blood and tissues
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Respiratory System: Exchange of Gases |
88%
Level 1: 80%+
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The partial pressure of CO2 in deoxygenated blood and tissues is about:
1. 40 mm Hg
2. 45 mm Hg
3. 100 mm Hg
4. 104 mm Hg
1. 40 mm Hg
2. 45 mm Hg
3. 100 mm Hg
4. 104 mm Hg
Subtopic: Respiratory System: Exchange of Gases |
89%
Level 1: 80%+
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The correct sequence of the magnitude of the partial pressure of oxygen [beginning at the maximum] will be:
| 1. | Atmospheric air → Oxygenated blood → Alveoli → Tissues |
| 2. | Alveoli → Atmospheric air → Oxygenated blood → Tissues |
| 3. | Atmospheric air → Alveoli → Oxygenated blood → Tissues |
| 4. | Alveoli → Atmospheric air → Oxygenated blood → Deoxygenated blood |
Subtopic: Respiratory System: Exchange of Gases |
89%
Level 1: 80%+
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The diffusion [respiratory] membrane in humans is composed of all the following layers except:
1. Squamous epithelium of alveoli
2. Endothelium of alveolar capillaries
3. Podocytes of the inner alveolar surface
4. Basement substance
1. Squamous epithelium of alveoli
2. Endothelium of alveolar capillaries
3. Podocytes of the inner alveolar surface
4. Basement substance
Subtopic: Respiratory System: Exchange of Gases |
91%
Level 1: 80%+
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Consider the given two statements:
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
| Statement I: | Each haemoglobin molecule can carry a maximum of four molecules of O2. |
| Statement II: | Hemoglobin can bind to four molecules of CO2. |
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: Respiratory System: Transport of Gases |
Level 3: 35%-60%
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The shape of the oxygen dissociation curve is:
1. a rectangular hyperbola
2. sigmoid
3. ellipse
4. parabola
1. a rectangular hyperbola
2. sigmoid
3. ellipse
4. parabola
Subtopic: Respiratory System: Transport of Gases |
96%
Level 1: 80%+
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At about what partial pressure of oxygen [mm Hg] is the haemoglobin in blood 50% saturated?
| 1. | 95 | 2. | 75 |
| 3. | 27 | 4. | 15 |
Subtopic: Respiratory System: Transport of Gases |
Level 3: 35%-60%
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CO2 is carried by haemoglobin as:
1. carbamino-haemoglobin
2. carboxy-haemoglobin
3. deoxy-haemoglobin
4. oxidised haemoglobin
1. carbamino-haemoglobin
2. carboxy-haemoglobin
3. deoxy-haemoglobin
4. oxidised haemoglobin
Subtopic: Respiratory System: Transport of Gases |
90%
Level 1: 80%+
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Identify the incorrect statement regarding carbonic anhydrase:
| 1. | RBCs contain a very high concentration of the enzyme. |
| 2. | It is not present at all in the plasma. |
| 3. | It assists rapid inter-conversion of carbon dioxide and water into carbonic acid, protons and bicarbonate ions. |
| 4. | The active site of the enzyme contains a zinc ion. |
Subtopic: Respiratory System: Transport of Gases |
78%
Level 2: 60%+
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Under normal physiological conditions, every 100 ml of oxygenated blood can deliver around:
1. 4 ml of O2 to the tissues.
2. 5 ml of O2 to the tissues.
3. 4 ml of O2 to the alveoli.
4. 5 ml of O2 to the alveoli.
1. 4 ml of O2 to the tissues.
2. 5 ml of O2 to the tissues.
3. 4 ml of O2 to the alveoli.
4. 5 ml of O2 to the alveoli.
Subtopic: Respiratory System: Transport of Gases |
86%
Level 1: 80%+
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