Respiratory System & Gas Exchange — NEET Biology
🔥 Predicted for NEET 2027Cells utilise oxygen for metabolism and produce energy along with substances like carbon dioxide which is harmful. Animals have evolved different mechanisms for the transport of oxygen to the cells and for the removal of carbon dioxide from there. We have a well developed respiratory system comprising two lungs and associated air passages to perform this function.
Adjacent to a frequently-asked paragraph in the same chapter.
Which are correct? i) Conducting part does not allow gas diffusion ii) Inspiration involves contraction of diaphragm and external intercostals iii) Pneumotaxic centre reduces duration of inspiration iv) Fibrosis increases thickness of the diffusion membrane and decreases O₂ uptake
View solution & NCERT explanation
Correct answer: D — all four
The conducting part transports air without gas exchange. During inspiration, diaphragm and external intercostal muscles contract, enlarging thoracic cavity. Pneumotaxic centre moderates inspiration duration. Fibrosis increases barrier thickness, lowering O₂ uptake.
What does NCERT say about Cells utilise oxygen for?
Has this concept appeared in NEET?
Which chapter is this from?
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.