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🧠 Effects of Drugs and Alcohol

A calm, straight-talking look at how drugs and alcohol change the body and brain, why the teenage years matter, and where to get help.

lessons

~15 min

to learn

🔬 Science

subject

Teens

level

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What you’ll learn

What Drugs and Alcohol DoUnderstand what a drug is, how substances reach the brain, and the difference between depressants and stimulants.A drug is any substance that changes how the body or brain works, including alcohol, nicotine, and caffeine. Whatever the route in, substances travel through the bloodstream to the brain and change its chemical signals. Depressants like alcohol slow the nervous system down, while stimulants speed it up.
Effects on Body and BrainTell short-term from long-term effects, understand why the teenage brain is vulnerable, and learn what addiction is.Short-term effects like slowed reactions and poor coordination appear fast and fade, while long-term heavy use can damage the liver, heart, and brain. The teenage brain is still developing into the mid-twenties, so substances affect it more and can disrupt that growth. Addiction is when the brain adapts so strongly that stopping becomes very hard.
Risks, Choices, and HelpRecognise the signs of an emergency, know how to help, handle pressure, and find trusted support.Drinking a large amount quickly can cause alcohol poisoning, with signs like confusion, vomiting, and being unable to stay awake, which are medical emergencies. If someone is in trouble, get an adult, call for help, and use the recovery position if they are unconscious but breathing. Having ready ways to say no helps with pressure, and trusted adults, doctors, and helplines are always there to help.

Questions this course answers

What is a drug?

A drug is any substance that changes how the body or brain works, which is why medicines, alcohol, nicotine, and caffeine all count.

Alcohol is which type of substance?

Alcohol is a depressant, meaning it slows down the nervous system, dulling reactions and coordination even though people often expect it to be a lift.

Why can alcohol and drugs be especially harmful to teenagers?

The teenage brain keeps developing into the mid-twenties, so substances can interfere with that growth and affect it more strongly.

Which of these is a short-term effect of drinking alcohol?

Slower reactions and poor coordination appear within minutes and fade as the alcohol leaves the body, making them short-term effects.

What does addiction mean?

Addiction is a health condition where the brain has adapted to a substance so strongly that stopping becomes very hard, not a matter of willpower.

A friend has drunk a dangerous amount and cannot stay awake. What is the best thing to do?

Being unable to stay awake is a sign of alcohol poisoning, a medical emergency, so the safe response is to get an adult and call for help straight away.

Grounded in trusted sources

NHS
National Institute on Drug Abuse (NIDA)
World Health Organization
Britannica

Every Wunder lesson is built from real, reputable sources — never invented.

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