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  • 1(current)
Q. No.
Assertion (A): Hb cannot get saturated with O2 more than 70%.
Reason (R): The affinity O2 to Hb increases with the rise of pCO2.
 
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: Transport of Gases Part 1 | Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
 69%
Level 2: 60%+
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Given below are two statements: 
Assertion (A): \(O_2\) binds with Hb in an irreversible manner.
Reason (R): \(CO_2\) combines with Hb both is an irreversible and reversible manner.
 
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: Exchange of Gases | Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
 74%
Level 2: 60%+
Hints

 
Assertion (A): In the alveoli, where there is high pO2, low pCO2, lesser H+ concentration and lower temperature, the factors are all favourable for the formation of oxyhemoglobin.
Reason (R): Every 100 mL of oxygenated blood deliver around 2.5 mL of O2 to the tissues normally.
 
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: Transport of Gases Part 1 | Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
 91%
Level 1: 80%+
Hints
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Assertion (A): CO2 is carried by Hb as carbaminohaemoglobin (about 20-25%).
Reason (R): When pCO2, is high and pO2 is low as in tissues, more binding of CO2 to Hb occurs.
 
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: Transport of Gases Part 1 | Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
 67%
Level 2: 60%+
Hints
The faster enzyme carbonic anhydrase requires:
1. Zn
2. Cu
3. Mn
4. Mg
Subtopic:  Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
 63%
Level 2: 60%+
Hints
Match the columns:
Column - I Column - II
A. Carboxyhaemoglobin i. O2
B. Carbaminohaemoglobin ii. NO-3
C. Methaemoglobin iii. CO2
D. Oxyhaemoglobin iv. CO

1. A = iii, B = iv, C = ii, D = ii
2. A = iv, B = iii, C - i, D = ii
3. A = iv, B = iii, C = ii, D = i
4. A = i, B = ii, C = iv, D = iii
 
Subtopic:  Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
 86%
Level 1: 80%+
Hints
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Which of the following is true for Bohr effect?
 
1. All the factors that shift the oxygen haemoglobin dissociation curve to the right increase Bohr effect
2. The overall result of Bohr effect is to allow greater O2 transport from lungs to tissues
3. Increase in CO2 concentration in the blood results in increased dissociation of oxyhaemoglobin
4. More than one option is correct
Subtopic:  Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
 77%
Level 2: 60%+
Hints
Read the following statements:
i. The approximate ratio of residual volume and total lung capacity is 1 : 5
ii. Haldane effect describes the dissociation of CO2 from Hb and facilitates its release into alveoli due to oxygenation of Hb
iii. Maximum CO2 is carried in the blood as NaHCO3
iv. When a plain dweller move to high altitudes (3,500 m or more), he/she will have increase in RBC production and decreased breathing rate
v. Under certain conditions, the P50 value of Hb rises, due to this the affinity of Hb of combining with O2 rises.

How many of the above statements are correct?
1. Two 2. Three
3. One 4. Four

 
Subtopic:  Respiratory System: Pulmonary Volumes & Capacities | Respiratory System: Exchange of Gases | Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
Level 4: Below 35%
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