BREATHING and EXCHANGE OF GASES
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Select correct statement releated to human beings respiratory system.
1 Cigarette smoking may lead to inflammation of mouth and nose
2 Neural signals from the pneumotoxic centre in the pons region of the brain cannot increase the duration of inspiration
3 Workers in grinding and stone breaking industries may suffer from lung fibrosis.
4 About$7\text{ }\!\!%\!\!\text{ }$ of $\text{C}{{\text{O}}_{2}}$ is carried out by haemoglobin as carbominohaemoglobin
Explanation:
(c) Workers in grinding and stone breaking industries may suffer from lung fibrosis.