Which one of the following is the correct statement for respiration in humans?
Correct answer: C. Asthma is a condition in which your airways narrow and swell and may produce extra mucus
- A. Cigarette smoking reduces inflammation of the bronchi
- B. Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration
- C. Asthma is a condition in which your airways narrow and swell and may produce extra mucus
- D. About 90% of carbon dioxide (CO2) is carried by haemoglobin as carbaminohaemoglobin
Explanation
Asthma involves the narrowing and swelling of airways and increased mucus production, which can lead to breathing difficulties.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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