Statement I: | pO2 in alveolar air is less than the pO2 in atmospheric air. |
Statement II: | pCO2 in alveolar air is less than the pCO2 in atmospheric air. |
1. | It is the maximum volume of air a person can breathe in after a forced expiration. |
2. | It includes ERV, TV, RV and IRV |
3. | It can also be defined as the maximum volume of air a person can breathe out after a forced inspiration. |
4. | It can be calculated as the difference between total lung capacity and residual volume. |
1. | Lower invertebrates like sponges, coelenterates, flatworms, etc., exchange O2 with CO2 by simple diffusion over their entire body surface. |
2. | Earthworms use their moist cuticle as respiratory surface. |
3. | Insects have a network of tubes (tracheal tubes) to transport atmospheric air within the body. |
4. | All vertebrates use lungs as respiratory organs. |
I: | clears the air from foreign particles |
II: | humidifies the air |
III: | brings the air to body temperature. |
Assertion (A): | Carbon dioxide (CO2) diffuses faster than oxygen (O2) across the respiratory membrane. |
Reason (R): | CO2 is 20–25 times more soluble in blood and alveolar fluids than O2. |
1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
2. | (A) is True but (R) is False. |
3. | Both (A) and (R) are True and (R) correctly explains (A). |
4. | (A) is False but (R) is True. |