Nicotine in tobacco:
Correct answer: C. Block the transport or oxygen
- A. Decreases the heart rate
- B. Decreases the blood pressure
- C. Block the transport or oxygen
- D. Paralyzes cells
Explanation
Nicotine causes your blood vessels to constrict or narrow, which limits the amount of blood that flows to your organs. Over time, the constant constriction results in blood vessels that are stiff and less elastic. Constricted blood vessels decrease the amount of oxygen and nutrients your cells receive. Options A and B are incorrect because nicotine increases the heart rate and blood pressure. Option D is incorrect because nicotine is known to paralyze cilia, not cells.
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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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