Q. No.What is true about RBCs in humans?
| 1. | They carry about 20-25 percent of |
| 2. | They transport 99.5 percent of |
| 3. | They transport about 80 percent oxygen only and the rest 20 percent of it is transported in a dissolved state in blood plasma |
| 4. | They do not carry at all |
Subtopic: Respiratory System: Transport of Gases |
80%
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Carbon dioxide is transported in blood by all the following mechanisms except:
1. bound to the protein portion of hemoglobin
2. bound to the iron atoms of hemoglobin
3. dissolved in plasma
4. as bicarbonate
Subtopic: Respiratory System: Transport of Gases |
52%
From NCERT
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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 |
Subtopic: Respiratory System: Transport of Gases |
87%
From NCERT
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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 |
From NCERT
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The binding of oxygen with hemoglobin is primarily related to:
| 1. | Partial pressure of carbon dioxide |
| 2. | Partial pressure of oxygen |
| 3. | H+ ion concentration in body fluids |
| 4. | Presence of 2,3-DPG in erythrocytes |
Subtopic: Respiratory System: Transport of Gases |
80%
From NCERT
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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%
From NCERT
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Regarding haemoglobin and oxygen binding:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | Oxygen binds with haemoglobin in an irreversible manner to form oxyhaemoglobin. |
| II: | Each haemoglobin molecule can carry a maximum of four molecules of O2. |
| III: | The binding of oxygen with haemoglobin is primarily related to the partial pressure of O2. |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Respiratory System: Transport of Gases |
74%
From NCERT
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Oxygen binding to haemoglobin in blood is
| 1. | directly proportional to the concentration of CO2 in the medium |
| 2. | inversely proportional to the concentration of CO2 in the medium |
| 3. | directly proportional to the concentration of CO in the medium |
| 4. | independent of the concentration of CO in the medium |
Subtopic: Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases |
81%
From NCERT
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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 |
Subtopic: Respiratory System: Transport of Gases |
74%
From NCERT
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What does a right shift in the oxygen dissociation curve of hemoglobin indicate about the physiological conditions?
| 1. | Decreased oxygen affinity, indicating conditions such as a lower pH, a higher temperature, or increased levels of CO2. |
| 2. | Increased oxygen affinity, indicating conditions such as a higher pH, a lower temperature, or decreased levels of CO2. |
| 3. | Decreased temperature and CO2 levels, leading to a reduced ability of hemoglobin to release oxygen to tissues. |
| 4. | Increased hemoglobin saturation with oxygen at lower partial pressures, indicating hyperventilation. |
Subtopic: Respiratory System: Transport of Gases |
84%
From NCERT
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