Drugs and the Human Body: A KS3 CIE Science Card Sort Guide — 药物与人体：KS3 CIE 科学卡片排序指南

📚 Drugs and the Human Body: A KS3 CIE Science Card Sort Guide | 药物与人体：KS3 CIE 科学卡片排序指南

在 CIE KS3 科学课程中，”药物与健康”（Drugs and Health）是生物学部分的核心主题之一。许多学校会用它设计一张卡片排序活动（card sort）：把不同药物的名称、作用与后果打乱，让学生重新分类。这篇文章既是一份完整的知识梳理，也是一份”评分标准说明书”——读完你不仅能分对卡片，还能明白考官究竟在找什么。

In the CIE KS3 Science curriculum, “Drugs and Health” is one of the core topics in the biology strand. Many schools use it to design a card sort activity: the names, effects and consequences of different drugs are shuffled, and students must re-sort them into groups. This article is both a complete knowledge guide and a “mark scheme manual” — after reading it, you will not only sort the cards correctly but also understand exactly what the examiner is looking for.

1. What Are Drugs? Prescription vs Over-the-Counter Medicines | 什么是药物？处方药与非处方药的区别

从科学角度看，药物（drug）是任何进入人体后改变身体运作方式的物质。有些药物用来治疗疾病，比如抗生素杀死细菌、止痛药缓解疼痛；另一些药物则被滥用，因为它们能改变情绪或意识，例如酒精、尼古丁和某些非法物质。需要注意：在科学语境里，”drug” 并不天然等于”毒品”——阿司匹林是 drug，咖啡因也是 drug。

From a scientific point of view, a drug is any substance that, when taken into the body, changes the way the body works. Some drugs are used to treat illness — antibiotics kill bacteria and painkillers relieve pain — while others are misused because they alter mood or consciousness, such as alcohol, nicotine and certain illegal substances. Note that in a scientific context “drug” does not automatically mean “illicit drug” — aspirin is a drug, and so is caffeine.

药物首先可以分为两大类。处方药（prescription medicines）只能凭医生处方购买，因为剂量、副作用和相互作用需要专业判断，例如抗生素和强效止痛药。非处方药（over-the-counter medicines，简称 OTC）可以在药店直接购买，例如扑热息痛（paracetamol）和感冒药。卡片排序的第一个常见考点，就是让学生判断某种药物属于哪一类，并说出理由。

Drugs fall into two broad groups first. Prescription medicines can only be bought with a doctor’s prescription, because dosage, side effects and interactions need professional judgement — antibiotics and strong painkillers are examples. Over-the-counter (OTC) medicines can be bought directly from a pharmacy, such as paracetamol and cold remedies. The first common card-sort question asks students to decide which group a drug belongs to and to justify their answer.

2. Three Key Drug Classes: Stimulants, Depressants and Painkillers | 三大药物类别：兴奋剂、抑制剂与止痛药

KS3 阶段最重要的分类是把药物按”对神经系统的作用”分成三类。兴奋剂（stimulants）加速脑和神经系统的活动，使人警觉、心跳加快，例如咖啡因、尼古丁和安非他命（amphetamines）。抑制剂（depressants）减慢神经系统活动，使人放松、反应变慢，例如酒精和镇静剂。止痛药（painkillers）则阻断疼痛信号，例如阿司匹林、布洛芬（ibuprofen）和吗啡（morphine）。

At KS3 the most important classification groups drugs by how they act on the nervous system. Stimulants speed up brain and nervous-system activity, making a person alert with a faster heartbeat — examples include caffeine, nicotine and amphetamines. Depressants slow nervous-system activity, making a person relaxed with slower reactions — examples include alcohol and sedatives. Painkillers block pain signals, such as aspirin, ibuprofen and morphine.

卡片排序活动通常会提供一张表格，列出药物名称、作用方式和例子，让学生把三者配对。记一个口诀很有用：兴奋剂 = 加速器（speeding up），抑制剂 = 刹车（slowing down），止痛药 = 信号屏蔽（blocking the signal）。在评分时，”说出类别 + 给出一个例子 + 说明对身体的作用”是标准的三点答案结构。

The card sort activity usually provides a table listing drug names, how they act, and examples, and asks students to match the three columns. A useful mnemonic: stimulants = accelerator (speeding up), depressants = brake (slowing down), painkillers = signal blocker (blocking the signal). In marking, “name the class + give one example + state the effect on the body” is the standard three-point answer structure.

3. Legal and Illegal Drugs: Why Some Substances Are Controlled | 合法与非法药物：为什么有些物质受到管制

并非所有药物都是非法的，也并非所有合法物质都无害。合法药物（legal drugs）包括医生处方的药物、OTC 药物以及成年人可合法购买的酒精和烟草。非法药物（illegal drugs）则受到法律禁止，例如海洛因（heroin）、可卡因（cocaine）和大麻（cannabis）。在英国，《药物滥用法》（Misuse of Drugs Act 1971）把非法药物分为 A、B、C 三类：A 类（如海洛因、可卡因）危害最大，处罚最重。

Not all drugs are illegal, and not all legal substances are harmless. Legal drugs include prescribed medicines, OTC medicines, and alcohol and tobacco that adults may legally buy. Illegal drugs are banned by law, such as heroin, cocaine and cannabis. In the UK, the Misuse of Drugs Act 1971 classifies illegal drugs into Classes A, B and C: Class A drugs (such as heroin and cocaine) are considered the most harmful and carry the severest penalties.

法律管制存在的原因很实际：这些物质成瘾性强、对健康的损害大，而且非法交易往往伴随暴力与犯罪。但学生需要理解一个关键区别——”合法”不等于”安全”。酒精和烟草都是合法的，却与肝病、肺癌和成瘾密切相关。评分标准中常有一分专门考查这一点：”解释为什么某些合法药物仍然危险。”

The reasons for legal control are practical: these substances are highly addictive, cause serious health damage, and illegal trade is often linked to violence and crime. But students must understand one key distinction — “legal” does not mean “safe”. Alcohol and tobacco are both legal, yet they are strongly linked to liver disease, lung cancer and addiction. Mark schemes often reserve one mark for this exact point: “Explain why some legal drugs are still dangerous.”

4. How Drugs Affect the Nervous System and Heart | 药物如何影响神经系统与心脏

药物之所以产生作用，是因为它们干扰了神经系统的信息传递。神经细胞（神经元）通过突触（synapse）传递信号，而神经递质（neurotransmitters）是携带信号的化学信使。兴奋剂会增加神经递质的释放或阻止其被回收，使信号”过载”，于是人变得兴奋、心跳和呼吸加快。抑制剂则减少或阻断信号传递，使大脑活动放缓，人会感到困倦、反应迟钝。

Drugs work because they interfere with signalling in the nervous system. Nerve cells (neurons) pass signals across synapses, and neurotransmitters are the chemical messengers that carry them. Stimulants increase the release of neurotransmitters or stop them being reabsorbed, so signals become “overloaded” and the person becomes excited with a faster heartbeat and breathing. Depressants reduce or block signalling, slowing brain activity, so the person feels drowsy and slow to react.

对心脏的影响是另一个高频考点。兴奋剂使心率（heart rate）和血压（blood pressure）上升，长期使用会加重心脏负担，增加心脏病和中风风险。抑制剂虽然让心率下降，但过量使用会抑制呼吸中枢，严重时导致昏迷甚至死亡。疼痛虽然被止痛药缓解，但滥用止痛药（尤其是吗啡类）同样会造成依赖。一张好的卡片排序卡片上，通常会同时写”作用部位”和”心率变化”，这正是考官想看学生连起来的知识点。

The effect on the heart is another frequent exam point. Stimulants raise heart rate and blood pressure, and long-term use puts extra strain on the heart, increasing the risk of heart attack and stroke. Depressants lower heart rate, but overdose depresses the breathing centre, which can lead to coma or even death. Painkillers relieve pain, yet misusing them (especially morphine-type drugs) still causes dependence. A good card-sort card usually carries both “site of action” and “change in heart rate” — exactly the knowledge the examiner wants students to connect.

5. Addiction and Tolerance: Why Drugs Are Hard to Give Up | 成瘾与耐受性：为什么药物难以戒断

成瘾（addiction）是药物滥用最严重的后果之一，指身体和心理都强烈依赖某种药物，不摄入就会难受。成瘾包含两个层面：心理依赖（psychological dependence）——渴望药物带来的快感或逃避；身体依赖（physical dependence）——身体已经适应药物，停药会出现戒断症状（withdrawal symptoms），如出汗、颤抖、焦虑。

Addiction is one of the most serious consequences of drug misuse: the body and mind become strongly dependent on a drug, and the person feels unwell without it. Addiction has two layers: psychological dependence — craving the pleasure or escape the drug brings; and physical dependence — the body has adapted to the drug, and stopping it causes withdrawal symptoms such as sweating, shaking and anxiety.

耐受性（tolerance）解释了为什么成瘾者需要不断加大剂量：随着反复使用，身体对同样剂量的反应越来越弱，必须增加剂量才能获得同样的效果。这就形成了一个危险的循环——剂量加大，身体损伤加重，戒断更难。在评分标准中，”成瘾定义、耐受性定义、戒断症状举例”常常各占一分，学生最容易漏掉的是把耐受性和成瘾明确区分开。

Tolerance explains why addicts need ever-larger doses: with repeated use the body responds less and less to the same dose, so a bigger dose is needed to achieve the same effect. This creates a dangerous cycle — the dose rises, the damage to the body grows, and withdrawal becomes harder. In mark schemes, “definition of addiction, definition of tolerance, and an example of a withdrawal symptom” each often carry one mark; the most common student error is failing to distinguish tolerance clearly from addiction.

6. The Card Sort Activity: How to Classify Drugs Correctly | 卡片排序活动：如何正确分类药物

卡片排序（card sort）是一种经典的形成性评价（formative assessment）活动。教师准备一套卡片，每张写一个药物名称、效应、例子或法律状态，学生按类别把它们分组。常见的分组方式有三种：按”兴奋剂/抑制剂/止痛药”分组、按”合法/非法”分组、按”处方药/非处方药”分组。CIE KS3 的课堂任务通常要求学生完成分类后，用一句完整句子说明每组的共同特征。

The card sort is a classic formative assessment activity. The teacher prepares a set of cards, each carrying a drug name, an effect, an example or a legal status, and students group them by category. Three grouping schemes are common: by “stimulant / depressant / painkiller”, by “legal / illegal”, and by “prescription / over-the-counter”. CIE KS3 classroom tasks usually require students to finish sorting and then state, in one full sentence, the shared feature of each group.

想分对卡片，关键是先找”特征词”而不是”药物名”。看到”加快心率、警觉、兴奋”就归兴奋剂；看到”减慢反应、放松、嗜睡”就归抑制剂；看到”缓解疼痛”就归止痛药。容易出错的陷阱卡片包括：酒精（抑制剂，不是兴奋剂，尽管人喝醉后看似”兴奋”）、尼古丁（兴奋剂，尽管来自烟草）、大麻（既有兴奋又有抑制效应，属于致幻/精神活性物质，KS3 通常按非法药物处理）。

To sort cards correctly, look for “feature words” first rather than drug names. “Faster heart rate, alert, excited” means stimulant; “slower reactions, relaxed, drowsy” means depressant; “relieves pain” means painkiller. The classic trap cards are: alcohol (a depressant, not a stimulant, even though a drunk person may appear “lively”), nicotine (a stimulant, even though it comes from tobacco), and cannabis (which has both stimulant and depressant effects — a psychoactive substance treated as an illegal drug at KS3).

7. Mark Scheme Walkthrough: Scoring Full Marks Step by Step | 评分标准逐条解读：如何一步步拿到满分

CIE KS3 科学（Biology 部分）的评分标准通常采用”点对点”结构：每个有效知识点给一分。以一道典型题目”分类并解释卡片上的药物”为例，完整得分点如下表所示。注意：考官只认三个要素——类别正确、例子匹配、效应描述准确。

CIE KS3 Science (Biology strand) mark schemes usually use a point-by-point structure: one mark for each valid knowledge point. Take a typical question, “Classify and explain the drugs on the cards”: the full set of marks is shown in the table below. Remember: the examiner only credits three elements — correct class, matching example, and accurate description of the effect.

得分点 Mark Point	正确答案范例 Example Answer	分值 Marks
识别类别 Identify the class	“Nicotine is a stimulant.” 尼古丁是兴奋剂	1
描述作用 Describe the effect	“It speeds up the nervous system and increases heart rate.” 它加速神经系统并提高心率	1
联系健康后果 Link to health	“It is addictive and can cause heart disease.” 它有成瘾性并可能引发心脏病	1
对比另一类 Compare with another class	“Unlike alcohol, a depressant, nicotine speeds the body up.” 与抑制剂酒精不同，尼古丁让身体加速	1

从这张表可以看出满分的”公式”：先给结论（类别），再给机制（作用），再给后果（健康），最后给对比（与其他类别区分）。许多学生丢分不是因为不懂，而是只写了类别没有写效应，或者把”兴奋剂使人兴奋”当成完整答案。记住：考官要的是”它让身体具体发生了什么变化”。

The table reveals the “formula” for full marks: state the conclusion (class), then the mechanism (effect), then the consequence (health), and finally a comparison (distinguishing from another class). Many students lose marks not because they don’t know the material, but because they write only the class without the effect, or treat “a stimulant makes you excited” as a complete answer. Remember: the examiner wants “exactly what change happens in the body”.

8. Safe Classroom Discussion: Talking About Drugs Wisely | 课堂安全讨论：药物教育的正确打开方式

药物话题在课堂上需要谨慎处理。CIE 课程大纲强调，教学目标是健康素养（health literacy）而非恐吓：学生应该理解药物的科学机制、法律后果和健康风险，同时学会拒绝同伴压力的技能（refusal skills）。教师通常会要求学生用”我”开头表达立场，例如”我不吸烟，因为……”，而不是评判他人的选择。

The drugs topic needs careful handling in the classroom. The CIE syllabus emphasises health literacy rather than scare tactics: students should understand the science of drugs, the legal consequences and the health risks, while also learning refusal skills to resist peer pressure. Teachers usually ask students to phrase positions with “I” statements, such as “I don’t smoke because…”, rather than judging other people’s choices.

最后做一个全篇回顾：药物是改变身体运作方式的物质；按作用可分为兴奋剂、抑制剂和止痛药；按法律可分为合法与非法药物；它们通过干扰神经递质影响神经和心脏；长期使用会导致耐受性与成瘾；卡片排序的关键是先找特征词再对号入座；评分标准看重”类别 + 效应 + 后果 + 对比”的完整结构。掌握这五条主线，无论是课堂卡片活动还是考试题目，你都能稳稳拿到分数。

To finish with a full recap: drugs are substances that change how the body works; by effect they divide into stimulants, depressants and painkillers; by law they divide into legal and illegal drugs; they affect the nervous system and heart by interfering with neurotransmitters; long-term use leads to tolerance and addiction; the key to the card sort is to find feature words before matching; and the mark scheme rewards the complete structure of “class + effect + consequence + comparison”. Master these five threads, and you will score steadily in both classroom card activities and exam questions.