Which of the following events happen when air enters lungs
1. Ribs and sternum raised
2. volume of thorax increased
3. Diaphragm contracted
4. All of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following events happen when air expelled from lungs
1. Ribs and sternum returned to original position
2. volume of thorax decreased
3. Diaphragm relaxed and arched upwards
4. All of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDiffusion membrane consists of
1. Squamous epithelium of alveoli
2. endothelium of alveolar capillaries
3. Basement substance between them
4. All of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe diffusion membrane or respiratory membrane does not include
1. Thin squamous epithelium
2. Pseudostratified ciliated epithelium
3. Endothelium
4. Basement membrane
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyGiven below are the partial pressures (in mmHg) of oxygen and carbondioxide at different parts involved in diffusion in comparison to those in atmosphere.
Respiratory gas | O2 | CO2 |
Atmospheric air | 159 | A |
Alveoli | B | 40 |
Body (deoxygenated) | 40 | C |
Blood (Oxygenated) | D | 40 |
Tissues | 40 | 45 |
Choose the correct option with respect to the values of partial pressures (in mmHg) marked as A, B, C and D
|
A |
B |
C |
D |
1. |
0.3 |
104 |
40 |
52 |
2. |
32 |
116 |
45 |
45 |
3. |
0.3 |
104 |
45 |
95 |
4. |
32 |
116 |
45 |
95 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn alveoli,
1. pCO2 is high and pO2is low
2. pCO2 is low and pO2 is high
3. pCO2 is low and pO2 low
4. None of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMore binding of CO2 occurs when pCO2 is _____ and pO2 is ____
1. high, high
2. low, high
3. high, low
4. low, low
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologypCO2 is high and pO2 is low can be found in
1. alveoli
2. tissues
3. blood
4. heart
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTransport of gases in alveoli takes place by:
1. Active transport | 2. Passive transport |
3. Simple diffusion | 4. None of the above |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe amount of CO2 that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher as compared to that of O2. This is because:
1. | Solubility coefficient of CO2 is higher |
2. | Solubility coefficient of CO2 is lesser |
3. | Amount of gases in blood is independent of partial pressures of the gases in the atmosphere |
4. | Arterial blood contains more O2 than CO2 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology