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.
Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?
NEET UG 2011 — Zoology Breathing and Exchange of Gases
2011mcqeasy
Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?
Official previous-year question
Held on 30 Apr 2011 · Verified 9 Jul 2026.
Options
- A
One can breathe out air totally without oxygen
- B
One can breathe out air through eustachian tubes by closing both the nose and the mouth
- C
One can consiously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all
- D
The lungs can be made fully empty by forcefully breathing out all air from them
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