NEET 2011
- Exam
- NEET
- Year
- 2011
- Subject
- Zoology
- Chapter
- Breathing and Exchange of Gases
NEET 2011 · Zoology · Breathing and Exchange of Gases
Which one of the following is a possibility for most of us in...
Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?
Options
- AOne can breathe out air totally without oxygen
- BOne can breathe out air through eustachian tubes by closing both the nose and the mouth
- COne can consiously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all
- DThe lungs can be made fully empty by forcefully breathing out all air from them
Correct answer
C. One can consiously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all
Step-by-step solution
The process of breathing involves the pathway of the human respiratory system and includes the nasal cavities, oral cavities, pharynx, trachea, primary bronchi, secondary bronchi and lungs with bronchioles and alveoli present. Breathing is a 2-fold process which includes breathing in and breathing out. During this process, the diaphragm which is the dome-shaped sheet of muscle located below the lungs contracts and expands along with the intercostal muscles to force air in and out of the lungs. Since intercostal muscles are also involved in the process of respiration, deeper respiration results in the movement of ribs too. Hence most of us can consciously breathe in and breathe out by moving the diaphragm alone.