<span>When a person smokes a cigarette, the body responds immediately to the chemical nicotine in the smoke. Nicotine causes a short-term increase in blood pressure, heart rate, and the flow of blood from the heart. It also causes the arteries to narrow. Carbon monoxide reduces the amount of oxygen the blood can carry. This, combined with the effects produced by nicotine, creates an imbalance in the demand for oxygen by the cells and the amount of oxygen the blood is able to supply.
So the answer is D. increased heart rate</span>
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im not completely sure but if a person is eating unhealthy food and doesnt care for their body thats the person who engages in habits most harmful to his/her body.
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To other people, abstinence means not having sexual intercourse during the time of the month that they may be most fertile. The best description of this practice is periodic abstinence, which is considered a method of natural family planning.
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