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Select the correct events that occur during inspiration. (i) Contraction of diaphragm (ii) Contraction of external inter-costal muscles (iii) Pulmonary volume decreases (iv) Intra pulmonary pressure increases

1. (a) (iii) and (iv)
2. (b) (i), (ii) and (iv)
3. (c) Only (iv)
4. (d) (i) and (ii)

Correct answer: (d) (i) and (ii)

Solution

Inspiration happens when the diaphragm contracts and flattens, and the external intercostal muscles contract to lift the ribs. This increases thoracic volume, so pulmonary pressure falls rather than rises.

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