Q. No.The amount of carbon dioxide that can diffuse through the diffusion membrane is much higher compared to that of oxygen because:
| 1. | the gradient across the membrane is much higher for carbon dioxide |
| 2. | carbon dioxide is more toxic than oxygen |
| 3. | solubility of carbon dioxide is much higher than that of oxygen |
| 4. | carbon dioxide has more affinity for hemoglobin than that of oxygen |
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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
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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 |
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Under normal physiological conditions, what amount of oxygen is delivered to the tissues?
| 1. 4 ml | 2. 5 ml |
| 3. 15 ml | 4. 20 ml |
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Identify the incorrect statement regarding the enzyme carbonic anhydrase:
1. RBCs contain a very high concentration of this enzyme
2. The enzyme is absent in the plasma
3. It facilitates the reaction catalyzed in both directions
4. It is a metalloenzyme
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What amount of carbon dioxide is delivered by every 100 ml of deoxygenated blood at the alveoli under normal physiological conditions?
| 1. 4 ml | 2. 5 ml |
| 3. 15 ml | 4. 20 ml |
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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 |
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The formation of oxy-hemoglobin at the alveoli is favored by all the following except:
| 1. High pO2 | 2. Low pCO2 |
| 3. Lower H+ ion concentration | 4. Higher temperature |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | The Bohr effect enables the body to adapt to changing conditions and makes it possible to supply extra oxygen to tissues that need it the most. |
| Reason (R): | A lower pH in strenuously metabolizing tissues promotes the dissociation of oxygen from haemoglobin, and allows the surrounding tissues to obtain enough oxygen to meet their demands. |
In the light of the above statements choose the correct answer from the options given below:
| 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. |
The binding of carbon dioxide to hemoglobin:
I: is related to the partial pressure of carbon dioxide
II: is affected by the partial pressure of oxygen
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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