Chapter 203 of 2363 min read

Respiratory organs and mechanism of breathing

Why this is asked: Quiet breathing is not two mirrored active steps: inspiration is active (the diaphragm contracts and flattens, intercostals lift the ribs, thoracic volume rises), but normal expiration is passive, driven by elastic recoil once those muscles relax. Only forced expiration calls in the internal intercostals and abdominal muscles — the detail NEET's active-or-passive options hinge on.

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Test yourself

•Match List I with List II.

List I	List II
A. Expiratory capacity	I. Expiratory reserve volume + Tidal volume + Inspiratory reserve volume
B. Functional residual capacity	II. Tidal volume + Expiratory reserve volume
C. Vital capacity	III. Tidal volume + Inspiratory reserve volume
D. Inspiratory capacity	IV. Expiratory reserve volume + Residual volume

Choose the correct answer from the options given below:

Open this in the full syllabus view · Zoology

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