Which one of the following is the correct statement for respiration in humans? - Biology MCQ Biology | ExamTest.live | ExamTest.live

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

A $About 90% of carbon dioxide (C O_{2}) is carried by haemoglobin as carbamino-haemoglobin$
B $Cigarette smoking may lead to inflammation of bronchi$
C $Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration$
D $Workers in grinding and stone-breaking industries may suffer from lung fibrosis$

Solution & Step-by-step Explanation

1. Correct: Occupational respiratory disorders like silicosis and asbestosis occur in grinding/stone industries. Long exposure causes inflammation leading to fibrosis (proliferation of fibrous tissues) and serious lung damage.2. C O_{2} transport: 70% as bicarbonate, 20 - 25% as carbamino-haemoglobin, 7% dissolved.3. Smoking causes emphysema (damage to alveolar walls).4. Pneumotaxic centre reduces the duration of inspiration.

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

A

About 90% of carbon dioxide (C O_{2}) is carried by haemoglobin as carbamino-haemoglobin

B

Cigarette smoking may lead to inflammation of bronchi

C

Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration

D

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

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Human Physiology Respiration Disorders

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