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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$A$ : The passage starting with the external nostrils up to the terminal bronchiole constitutes the respiratory part.
$R$ : The respiratory part transports the air to the alveoli,clears it from foreign materials,humidifies it,and brings the air to body temperature.

$(1)$ $Cl^-$ translocation is required during the transport of $CO_2$.
$(2)$ The probability of lung cancer increases due to smoking.

Statement-$I$: The anatomical setup of the lungs in the thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung cavity.
Statement-$II$: The volume of air remaining in the lungs even after a forcible expiration is called residual volume.

What does abdominal breathing indicate?

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