Drugs Lesson | KS3 Biology | RevisionTown

This lesson covers: 

  1. Legal and illegal drugs
  2. How drugs affect the body’s life processes
  3. Examples of common recreational drugs and their impacts

 

What are drugs?

A drug is defined as any substance that affects the normal functions of the body.

There are two main categories of drugs:

  1. Legal drugs – Substances that are legally available for purchase and consumption such as alcohol, caffeine, and some medicinal drugs.
  2. Illegal drugs – Substances that it is against the law to buy, possess, or take such as cannabis, cocaine, and heroin.

How drugs impact the body’s processes

The human body has seven key life processes that allow it to survive and function.

Recreational drugs often affect the brain, impacting processes like movement, sensitivity, and behaviour.

Drugs can also damage organs involved in other life processes, such as the liver and kidneys that handle excretion.

Examples of recreational drugs

Common legal and illegal recreational drugs impact the body in several ways.

 

Solvents

Solvents are found in household items like paint and glue.

They can cause:

  • Hallucinations, which involve seeing or hearing things that are not real.
  • Personality and behaviour changes.
  • Lung, brain, liver, and kidney damage.
 

Alcohol

Alcohol is a nervous system depressant. 

It can cause:

  • Slow brain activity and responses.
  • Damage to organs like the brain and liver.
  • Impaired judgement, coordination, and memory.
  • Liver disease and cancer.
  • Addiction.
 

Illegal drugs

Illegal drugs include those like heroin, cocaine, and ecstasy.

They can cause:

  • Hallucinations and loss of touch with reality.
  • Organ damage and failure.
  • Overdose and death.
  • Addiction.

Practice Quiz 

1. What are drugs?

Answer: Drugs are substances that affect the normal functions of the body. They can be legal (such as alcohol and caffeine) or illegal (such as cannabis and cocaine).

2. What is the difference between legal and illegal drugs?

Answer: Legal drugs are substances that are legally available for purchase and consumption, while illegal drugs are substances that it is against the law to buy, possess, or take.

3. What are examples of legal drugs?

Answer: Examples of legal drugs include alcohol, caffeine, nicotine, and prescription medications.

4. What are examples of illegal drugs?

Answer: Examples of illegal drugs include cannabis, cocaine, heroin, and ecstasy.

5. How do drugs affect the body’s life processes?

Answer: Drugs can impact the brain, affecting movement, sensitivity, and behavior, and can damage organs such as the liver and kidneys involved in excretion and other life processes.

6. What are recreational drugs?

Answer: Recreational drugs are substances taken for pleasure rather than for medical reasons. They can be legal or illegal and often have psychoactive effects.

7. What are the effects of alcohol on the body?

Answer: Alcohol is a nervous system depressant that can slow brain activity, impair judgment, coordination, and memory, and cause liver disease, cancer, and addiction.

8. How does caffeine affect the body?

Answer: Caffeine is a stimulant that increases alertness, energy levels, and heart rate. It can also cause insomnia, anxiety, and dependence if consumed in large amounts.

9. What are the dangers of nicotine?

Answer: Nicotine is highly addictive and can increase heart rate and blood pressure, leading to heart disease, respiratory issues, and various cancers, especially lung cancer.

10. What are the effects of cannabis on the body?

Answer: Cannabis can cause relaxation, altered perception, increased appetite, impaired memory, and coordination, and in some cases, anxiety and paranoia.

11. How does cocaine affect the brain?

Answer: Cocaine is a stimulant that increases levels of dopamine in the brain, leading to euphoria, increased energy, and alertness, but also anxiety, paranoia, and a high risk of addiction.

12. What are the effects of heroin on the body?

Answer: Heroin is an opioid that causes intense euphoria, pain relief, and drowsiness, but also respiratory depression, constipation, and a high risk of overdose and addiction.

13. What are the risks associated with ecstasy use?

Answer: Ecstasy can cause euphoria, increased sociability, and heightened sensory perception but also dehydration, hyperthermia, heart problems, and long-term damage to serotonin-producing neurons.

14. What is drug addiction?

Answer: Drug addiction is a chronic, relapsing disorder characterized by compulsive drug seeking and use despite harmful consequences, and long-lasting changes in the brain.

15. How do solvents affect the body?

Answer: Solvents, found in household items like paint and glue, can cause hallucinations, personality changes, and damage to the lungs, brain, liver, and kidneys.

16. What are hallucinogens?

Answer: Hallucinogens are drugs that cause hallucinations, which are perceptions of things that are not real. Examples include LSD, psilocybin (magic mushrooms), and PCP.

17. How does methamphetamine affect the body?

Answer: Methamphetamine is a powerful stimulant that increases alertness, energy, and euphoria, but also causes severe dental problems (meth mouth), skin sores, and a high risk of addiction.

18. What are the effects of prescription drug abuse?

Answer: Prescription drug abuse can lead to addiction, overdose, and various health issues depending on the drug, such as respiratory depression with opioids or heart problems with stimulants.

19. What is the role of the liver in drug metabolism?

Answer: The liver metabolizes drugs, breaking them down into substances that can be excreted from the body. This process can be taxing on the liver and lead to damage over time.

20. How do opioids affect the body?

Answer: Opioids provide pain relief and euphoria but can also cause drowsiness, constipation, respiratory depression, and a high risk of addiction and overdose.

21. What are the long-term effects of drug abuse?

Answer: Long-term effects of drug abuse can include chronic health problems, mental health disorders, social and relationship issues, financial problems, and legal consequences.

22. What is the impact of drug abuse on mental health?

Answer: Drug abuse can lead to mental health issues such as depression, anxiety, paranoia, and psychosis, and can worsen pre-existing mental health conditions.

23. How does drug abuse affect families and communities?

Answer: Drug abuse can lead to strained relationships, domestic violence, child neglect, and increased crime rates, impacting families and communities.

24. What is the treatment for drug addiction?

Answer: Treatment for drug addiction often includes a combination of medication, behavioral therapy, counseling, and support groups to address both physical and psychological aspects of addiction.

25. What are withdrawal symptoms?

Answer: Withdrawal symptoms are physical and psychological effects that occur when a person stops using a drug they are dependent on, and can include nausea, sweating, anxiety, and seizures.

26. How do stimulants affect the body?

Answer: Stimulants increase alertness, energy, and heart rate, but can also cause anxiety, paranoia, heart problems, and addiction. Examples include cocaine, amphetamines, and caffeine.

27. What are the dangers of synthetic drugs?

Answer: Synthetic drugs, such as synthetic cannabinoids (spice) and synthetic cathinones (bath salts), can cause unpredictable and severe health effects, including aggression, hallucinations, and organ damage.

28. How do depressants affect the body?

Answer: Depressants slow down the central nervous system, causing relaxation and drowsiness, but can also lead to respiratory depression, addiction, and overdose. Examples include alcohol, benzodiazepines, and barbiturates.

29. What are the signs of drug addiction?

Answer: Signs of drug addiction include compulsive drug use, inability to stop using, neglecting responsibilities, withdrawal symptoms, and continued use despite negative consequences.

30. What is the role of rehabilitation centers in drug addiction treatment?

Answer: Rehabilitation centers provide structured programs that include medical supervision, therapy, counseling, and support to help individuals recover from addiction.

31. How do psychedelics affect the brain?

Answer: Psychedelics affect the brain by altering perception, mood, and cognition, leading to hallucinations and an altered sense of reality. Examples include LSD, psilocybin, and DMT.

32. What is drug tolerance?

Answer: Drug tolerance occurs when the body becomes accustomed to a drug, requiring higher doses to achieve the same effect, increasing the risk of overdose and dependence.

33. What are the effects of anabolic steroids?

Answer: Anabolic steroids increase muscle mass and strength but can also cause liver damage, heart problems, aggressive behavior, and reproductive issues.

34. What is the impact of drug abuse on the cardiovascular system?

Answer: Drug abuse can cause cardiovascular issues such as high blood pressure, heart attacks, strokes, and arrhythmias, particularly with stimulants like cocaine and methamphetamine.

35. What are the legal consequences of drug possession?

Answer: Legal consequences of drug possession can include fines, imprisonment, a criminal record, and loss of employment or educational opportunities.

36. How does drug abuse affect the brain’s reward system?

Answer: Drug abuse affects the brain’s reward system by releasing large amounts of dopamine, reinforcing drug use and leading to changes in brain structure and function that perpetuate addiction.

37. What is drug overdose and how can it be treated?

Answer: A drug overdose occurs when a person consumes a toxic amount of a drug, leading to severe health effects or death. Treatment includes administering antidotes (like naloxone for opioids), supportive care, and emergency medical intervention.

38. What are the social impacts of drug abuse?

Answer: Social impacts of drug abuse include increased crime rates, family breakdowns, loss of productivity, and higher healthcare and legal system costs.

39. What are club drugs and their effects?

Answer: Club drugs, such as MDMA (ecstasy), GHB, and ketamine, are often used at parties and clubs. They can cause euphoria, altered perceptions, memory loss, and dangerous physical and psychological effects.

40. How can drug abuse be prevented?

Answer: Drug abuse prevention strategies include education, promoting healthy lifestyles, providing support and counseling, enforcing laws, and reducing access to drugs.

41. What are inhalants and their dangers?

Answer: Inhalants are substances like glue, paint, and solvents that are inhaled to achieve a high. They can cause hallucinations, brain damage, organ failure, and sudden death.

42. What is the role of support groups in recovery from drug addiction?

Answer: Support groups provide a community of individuals with similar experiences, offering emotional support, encouragement, and practical advice to help individuals maintain sobriety.

43. How does drug addiction affect the workplace?

Answer: Drug addiction can lead to decreased productivity, absenteeism, accidents, and higher healthcare costs in the workplace.

44. What are the effects of drug abuse on mental health?

Answer: Drug abuse can worsen mental health conditions, increase the risk of developing mental illnesses, and lead to symptoms like anxiety, depression, and psychosis.

45. What is the impact of drug abuse on academic performance?

Answer: Drug abuse can impair cognitive function, concentration, and memory, leading to poor academic performance and increased dropout rates.

46. How does drug abuse affect personal relationships?

Answer: Drug abuse can strain relationships, lead to conflict, mistrust, and breakdowns in communication, and cause emotional and financial stress.

47. What are the health risks of sharing needles for drug use?

Answer: Sharing needles increases the risk of transmitting infectious diseases such as HIV, hepatitis B and C, and other bloodborne pathogens.

48. What is harm reduction in the context of drug use?

Answer: Harm reduction refers to strategies and practices aimed at minimizing the negative health, social, and legal impacts of drug use, such as needle exchange programs and supervised injection sites.

49. How do drugs affect the immune system?

Answer: Drugs can weaken the immune system, making the body more susceptible to infections and diseases, and impair the body’s ability to heal and recover.

50. What is the role of public health initiatives in addressing drug abuse?

Answer: Public health initiatives focus on prevention, education, treatment, and policy-making to reduce drug abuse and its impact on individuals and communities.