Steps of Respiration and Gas Exchange — NEET Biology
📚 Practice ConceptThe first step in respiration is breathing by which atmospheric air is taken in (inspiration) and the alveolar air is released out (expiration). Exchange of O₂ and CO₂ between deoxygenated blood and alveoli, transport of these gases throughout the body by blood, exchange of O₂ and CO₂ between the oxygenated blood and tissues and utilisation of O₂ by the cells (cellular respiration) are the other steps involved.
Arrange the following steps of respiration in the correct sequence 1. Diffusion of gases (O, and CO₂) across alveolar membrane. 2. Utilisation of O, by the cells for catabolic reactions and resultant release of CO 3. Breathing or pulmonary ventilation by which atmospheric air is drawn in and CO, rich alveolar air is released out. 4. Transport of gases by the blood. 5. Diffusion of O, and CO₂ between blood and tissues.
View solution & NCERT explanation
Correct answer: A — 3 → 1 → 4 → 5 → 2
Explanation (why a) 3 → 1 → 4 → 5 → 2 is correct: Ventilation (3) brings fresh atmospheric air to alveoli; only then can gases diffuse across the alveolar membrane (1). The blood then transports these gases (4) to peripheral tissues, where diffusion between blood and tissues occurs (5). Finally, cells utilise O₂ for catabolism with resultant CO₂ release (2).
What does NCERT say about first step respiration breathing?
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Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.