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Drugs and the Body

In this worksheet, students will look at the different types of drugs that exist and what effects they have in the human body.

'Drugs and the Body' worksheet

Key stage:  KS 3

Curriculum topic:   Biology: Structure and Function of Living Organisms

Curriculum subtopic:   Health

Difficulty level:  

Worksheet Overview

Drugs are simply chemicals that can affect the way your body works. There are many different types of drugs and they can be put into two main categories:

  • Medicines – Used to help people suffering from pain or disease
  • Recreational drugs – taken for pleasure

 

Medicines      Medicine bottles

Medicines contain drugs that help the body when it is not working correctly. Drugs such as antibiotics fight micro-organisms which can interfere with the chemical reactions in the body.

Medicines can be further divided into over-the-counter drugs and prescription drugs:

  • Over-the-counter drugs include paracetamol and asprin and can be easily bought in pharmacies and supermarkets.
  • Prescription drugs, such as Glucophage (a diabetes drug) and co-codamol (a pain relieving drug), however, are only available from pharmacies with a prescription from your GP.    


Although medicines can be easily bought or prescribed by doctors this does not mean that they are completely safe.  Medicines can have many different side effects so it is important to read the information leaflet before taking any medicines.

 

Recreational Drugs    Alcohol and cigarette

Some recreational drugs are legal, such as alcohol, caffeine and nicotine. However, most other recreational drugs are illegal, such as cocaine, ecstasy and heroin.  

Effects of drug misuse:

  • All recreational drugs can be addictive
  • Damage to the liver is common as it is the organ which breaks down drugs in the body.
  • The injecting of drugs can also lead to various diseases such as HIV and hepatitis, caught through the use of contaminated needles.

 

Recreational drugs fall under two categories: depressants or stimulants, each having a different effect on the body.


Depressants

Depressant are drugs which slow down messages to the brain and nerves. Examples of depressants are alcohol, cannabis, solvents (such as aerosols and glue) and heroin.

The typical effects of depressants on the body are:

  • Slowed brain functions such as thinking and muscle movement
  • Blurred vision or hallucinations
  • Slowed pulse and lowered blood pressure
  • Impaired judgement and coordination



These effects usually wear off; however, there are some long term effects of the use of depressants.

  • Solvent abuse causes a rash around the nose and mouth
  • Cannabis causes loss of memory and concentration, as well as an increased risk of mental illness.
  • Alcohol can lead to weight gain

 

Stimulants   

Stimulants do the opposite of depressants. They speed up messages to the brain and nerves and make you feel more alert.  Examples of stimulants are caffeine (found in coffee, tea and fizzy drinks) which is legal; then there's cocaine, ecstasy and amphetamines which are all illegal.

The typical effects of stimulants on the body are:

  • More energy and confidence (stimulants are often illegally used in sports for this reason)
  • Damage to the liver
  • Damage to the heart
  • Memory loss
  • Lack of concentration

 

Addiction   

Addiction is a dependency on a drug leading to cravings, anxiety or panic. Addiction is a problem with all types of drugs including medicines and prescription drugs.

Person with addiction



The development of withdrawal symptoms when the drug is not available is also an issue.  Withdrawal symptoms include insomnia, weakness and nausea. For continual and high-dose users, agitation, high body temperature and hallucinations can occur.  Unlike withdrawal from most drugs, withdrawal from depressants can be life-threatening.

 

We will now answer some questions on the effects of drugs on the human body.

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