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Q. No.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
Subtopic: Respiratory System: Exchange of Gases |
91%
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 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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At about what partial pressure of oxygen [mm Hg] is the haemoglobin in blood 50% saturated?
1. 95
2. 75
3. 27
4. 15
1. 95
2. 75
3. 27
4. 15
Subtopic: Respiratory System: Transport of Gases |
From NCERT
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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%
From NCERT
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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 |
80%
From NCERT
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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%
From NCERT
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Regarding neural regulation of respiration in humans:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | The respiratory rhythm is present in the medulla region of the brain. |
| II: | Pneumotaxic centre present in cerebrum can moderate the functions of the respiratory rhythm centre. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Respiratory System: Regulation of Respiration |
74%
From NCERT
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A difficulty in breathing causing wheezing due to inflammation of bronchi and bronchioles characterises:
1. Emphysema
2. Asthma
3. Tuberculosis
4. Common cold
1. Emphysema
2. Asthma
3. Tuberculosis
4. Common cold
Subtopic: Respiratory Disorders: Part 1 | Respiratory Disorders: Part 2 |
92%
From NCERT
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Occupational Respiratory Disorders:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | are caused by long exposure to dust at work place. |
| II: | can give rise to inflammation leading to fibrosis (proliferation of fibrous tissues) and thus causing serious lung damage. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Respiratory Disorders: Part 1 | Respiratory Disorders: Part 2 | Respiratory Disorders - III |
96%
From NCERT
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