Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?
1. | The lungs can be made fully empty by forcefully breathing out all air from them |
2. | One can breathe out air totally without oxygen |
3. | One can breathe out air through Eustachian tubes by closing both the nose and the mouth. |
4. | One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all. |
Which one of the following statements is incorrect?
1. | The residual air in the lungs slightly decreases the efficiency of respiration in mammals |
2. | The presence of non-respiratory air sacs increases the efficiency of respiration in birds |
3. | In mammals, circulating body fluids serve to distribute oxygen to tissues |
4. | The principle of countercurrent flow facilitates efficient respiration in the gills of fishes |