1. (a) Smoking tobacco is the cause of 9 out of 10 cases of lung cancer - Edexcel - GCSE Biology - Question 1 - 2012 - Paper 1
Question 1
1. (a) Smoking tobacco is the cause of 9 out of 10 cases of lung cancer.
(i) Complete the sentence by putting a cross (X) in the box next to your answer.
The activ... show full transcript
Worked Solution & Example Answer:1. (a) Smoking tobacco is the cause of 9 out of 10 cases of lung cancer - Edexcel - GCSE Biology - Question 1 - 2012 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The correct choice is C nicotine. Nicotine is the main addictive substance found in cigarette smoke, responsible for the dependence associated with smoking.
Step 2
Explain why it can be very difficult to give up smoking.
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Answer
Giving up smoking can be very difficult primarily due to the addictive nature of nicotine. When someone smokes, nicotine enters the bloodstream quickly and stimulates the release of neurotransmitters like dopamine, which creates feelings of pleasure and reward. Over time, the brain adapts to the presence of nicotine, and when a person tries to quit, they may experience withdrawal symptoms such as irritability, anxiety, and cravings. These symptoms can make it challenging for individuals to resist the urge to smoke, contributing to the high relapse rates observed among those attempting to quit.
Step 3
State the group of drugs which increase the speed of reactions.
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Answer
The group of drugs that increase the speed of reactions are known as stimulants. Stimulants enhance activity in the central nervous system, leading to increased alertness, concentration, and physical performance.
