The component of cigarette smoke responsible for addiction and for raising heart rate and blood pressure is
Correct answer: D. nicotine
- A. tar
- B. carbon monoxide
- C. benzene
- D. nicotine
Explanation
Nicotine reaches the brain within seconds and acts on receptors there to give the reward that makes smoking so hard to give up, while also constricting arterioles and stimulating adrenaline release. Tar is the sticky carcinogenic residue that damages the airways, and carbon monoxide reduces the oxygen carrying power of the blood. All three are harmful, but only nicotine causes the dependence.
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About Effects of Smoking
Smoking exposes the respiratory system to nicotine, tar and carbon monoxide, damaging cilia, reducing oxygen transport and narrowing or inflaming airways. The topic covers dependence, chronic bronchitis, emphysema, lung cancer and cardiovascular effects, while separating short-term physiological changes from long-term disease.
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