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Which one of the following is the correct statement for respiration in humans?
A
About 90% of carbon dioxide ($CO_2$) 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
Detailed Solution
In grinding or stone-breaking industries so much dust is produced that the body's defence cannot cope with it.
Long exposure causes inflammation leading to fibrosis (proliferation of fibrous tissue) and serious lung damage.
Only about 20–25 per cent of $CO_2$ is carried as carbamino-haemoglobin, and the pneumotaxic centre reduces the duration of inspiration.
Long exposure causes inflammation leading to fibrosis (proliferation of fibrous tissue) and serious lung damage.
Only about 20–25 per cent of $CO_2$ is carried as carbamino-haemoglobin, and the pneumotaxic centre reduces the duration of inspiration.