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Which one of the following is the correct statement for respiration in humans?

1.	Cigarette smoking may lead to inflammation of the bronchi
2.	Neural signals from the pneumotaxic centre in the pons region of the brain can increase the duration of inspiration
3.	Workers in grinding and stone-breaking industries may suffer from lung fibrosis
4.	About 90% of carbon dioxide (CO₂) is carried by haemoglobin as carbaminohaemoglobin

Subtopic: Respiratory Disorders - III |

79%

Level 2: 60%+

AIPMT - 2012

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