Which of the following statements is correct | vedclass

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(D) $1$. Cigarette smoking is a major cause of emphysema and chronic bronchitis,which involves inflammation of the bronchi. Thus,statement $(A)$ is co

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$(A)$ and $(C)$

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(D) $1$. Cigarette smoking is a major cause of emphysema and chronic bronchitis,which involves inflammation of the bronchi. Thus,statement $(A)$ is correct.$2$. The pneumotaxic center present in the pons region of the brain primarily acts as a 'switch off' point for inspiration. It reduces the duration of inspiration,thereby altering the respiratory rate. Thus,statement $(B)$ is incorrect.$3$. 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 fibrosis (proliferation of fibrous tissues) and thus cause serious lung damage. Thus,statement $(C)$ is correct.$4$. Since both $(A)$ and $(C)$ are correct,the correct option is $(D)$.

Which of the following statements is correct regarding human respiration?

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