Which of the following are the correct statem | vedclass

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(A, C) Statement $A$ is correct: Cigarette smoking is a major cause of chronic bronchitis,which involves the inflammation of the bronchi.Statement $B$

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Workers in grinding and stone-breaking industries may suffer from lung fibrosis.

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(A, C) Statement $A$ is correct: Cigarette smoking is a major cause of chronic bronchitis,which involves the inflammation of the bronchi.Statement $B$ is incorrect: The pneumotaxic center in the pons region of the brain primarily moderates the functions of the respiratory rhythm center and can reduce the duration of inspiration.Statement $C$ is correct: In certain industries,especially those involving grinding or stone-breaking,so much dust is produced that the defense mechanism of the body cannot fully cope with the situation. Long-term exposure can give rise to inflammation leading to fibrous proliferation (fibrosis) and thus cause serious lung damage.Statement $D$ is incorrect: Only about $20-25\%$ of $CO_2$ is carried by haemoglobin as carbamino-haemoglobin. About $70\%$ is carried as bicarbonate and $7\%$ is dissolved in plasma.

Which of the following are the correct statements regarding respiration in humans?

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