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Q. No.Transport of gases in alveoli takes place by :
1.
Active transport
2.
Passive transport
3.
Simple diffusion
4.
None
Subtopic: Respiratory System: Exchange of Gases |
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What happens to the volume of the pulmonary cavity when there is an increase in the volume of the thoracic chamber?
| 1. | It decreases |
| 2. | It increases |
| 3. | It remains the same |
| 4. | First decreases and then increases |
Subtopic: Respiratory System: Pulmonary Ventilation |
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Level 2: 60%+
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In breathing:
| 1. | Contraction of internal costal muscles leads to inhalation |
| 2. | Contraction of diaphragm increases the volume of thoracic chamber in dorso-ventral axis |
| 3. | Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure |
| 4. | The residual volume of the lungs averages 2500 ml to 3000 ml |
Subtopic: Respiratory System: Pulmonary Ventilation |
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The partial pressure of oxygen is expected to be least in:
| 1. | Atmospheric air | 2. | Alveoli |
| 3. | Oxygenated blood | 4. | Tissues |
Subtopic: Respiratory System: Exchange of Gases |
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At the alveoli:
| I: | The factors are all favourable for the formation of oxyhemoglobin. |
| II: | Carbon dioxide trapped as bicarbonate at the tissue level is released out as carbon dioxide. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Respiratory System: Exchange of Gases |
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Chemosensitive area of respiratory centre medulla is affected by:
1. less and ions
2. less and ions
3. excess and H+ ions
4. excess and H+ ions.
Subtopic: Respiratory System: Regulation of Respiration |
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Inspiration during breathing occurs when the pressure in lungs is:
| 1. | Zero |
| 2. | Negative with respect to atmospheric pressure |
| 3. | Equal to atmospheric pressure |
| 4. | Positive with respect to atmospheric pressure |
Subtopic: Respiratory System: Pulmonary Ventilation |
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Identify the region of human brain which has pneumotaxic centre that alters respiratory rate by reducing the duration of inspiration.
| 1. | Medulla | 2. | Pons |
| 3. | Thalamus | 4. | Cerebrum |
Subtopic: Respiratory System: Regulation of Respiration |
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Level 1: 80%+
NEET - 2022
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Given below is the representation of partial pressures (in mm Hg) of oxygen and carbon dioxide in different parts involved in diffusion in comparison to those in the atmosphere.
Choose the option which mentions the correct values of A, B, C and D:
| Respiratory gas | O2 | CO2 |
| Atmospheric air | A | 0.3 |
| Alveoli | 104 | 40 |
| Blood (oxygenated) | B | 40 |
| Blood (deoxygenated) | 40 | C |
| Tissue | D | 45 |
Choose the option which mentions the correct values of A, B, C and D:
| A | B | C | D | |
| 1. | 159 | 45 | 95 | 40 |
| 2. | 159 | 95 | 45 | 40 |
| 3. | 145 | 40 | 45 | 95 |
| 4. | 104 | 45 | 45 | 40 |
Subtopic: Respiratory System: Exchange of Gases |
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Thoracic chamber is formed:
| (i) | Dorsally by vertebral column |
| (ii) | Ventrally by sternum |
| (iii) | Laterally by ribs |
| (iv) | Lower side by diaphragm |
| 1. | (i) and (iii) only |
| 2. | (i), (ii) and (iii) only |
| 3. | (ii), (iii) and (iv) only |
| 4. | (i), (ii), (iii) and (iv) |
Subtopic: Respiratory System: Trachea & Basic Anatomy of Lung |
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