NEET
- Exam
- NEET
- Subject
- Zoology
- Chapter
- Breathing and Exchange of Gases
NEET · Zoology · Breathing and Exchange of Gases
What is the first step in the process of respiration?
What is the first step in the process of respiration?
Options
- ADiffusion of gases across alveolar membrane
- BBreathing or pulmonary ventilation
- CTransport of gases by the blood
- DUtilisation of O₂ by the cells
Correct answer
B. Breathing or pulmonary ventilation
Step-by-step solution
Respiration involves the following steps: (i) Breathing or pulmonary ventilation by which atmospheric air is drawn in and CO₂ rich alveolar air is released out. (ii) Diffusion of gases (O₂ and CO₂) across alveolar membrane. (iii) Transport of gases by the blood. (iv) Diffusion of O₂ and CO₂ between blood and tissues. (v) Utilisation of O₂ by the cells for catabolic reactions and resultant release of CO₂