Q. No.When carbon dioxide combines with haemoglobin in blood, it forms:
1. Carboxyhemoglobin
2. Carbaminohemoglobin
3. Methemoglobin
4. Oxidized hemoglobin
1. Carboxyhemoglobin
2. Carbaminohemoglobin
3. Methemoglobin
4. Oxidized hemoglobin
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Which of the following has the highest affinity for oxygen?
1. HbS
2. HbA
3. HbF
4. Methemoglobin
Which of the given three layers in the respiratory membrane is/are one-celled thick?
| I: | Alveolar epithelium |
| II: | Basement substance |
| III: | Vascular endothelium |
| 1. | Only I | 2. | Only I and II |
| 3. | Only I and III | 4. | I, II and III |
Which occupational lung disorder can lead to cancer of lung?
1. Silicosis
2. Byssinosis
3. Bagassosis
4. Asbestosis
It is necessary that lungs must be present in anatomically air-tight chamber because:
| 1. | we cannot directly alter the pulmonary volume |
| 2. | our lungs are not made of any elastic tissue |
| 3. | the pleural cavity always has a positive pressure with respect to pulmonary pressure |
| 4. | the partial pressure of oxygen in atmosphere is less than that in the alveoli |
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The respiratory diffusion membrane is made of all the following layers except:
| 1. Alveolar epithelium | 2. Basement layer |
| 3. Vascular endothelium | 4. Surfactant |
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Consider the following statements:
| I: | The thoracic chamber is anatomically an air tight chamber. |
| II: | Any change in the volume of the thoracic cavity will be reflected in the pulmonary cavity. |
1. Both I and II are correct and II explains I
2. Both I and II are correct and I explains II
3. Both I and II are correct but II does not explain I
4. Both I and II are incorrect
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The main respiratory center in humans is located in:
1. Hypothalamus
2. Thalamus
3. Medulla oblongata
4. Pons
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Under normal resting conditions, almost all respiratory effort is due to:
1. contraction and relaxation of diaphragm
2. elevation of rib cage
3. depression of rib cage
4. contraction of abdominal muscles
The peripheral chemoreceptors for regulation of respiration are located:
1. adjacent to the rhythm center
2. near arch of aorta and carotid artery
3. in the walls of trachea
4. in the walls of the alveoli
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