• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Biology - Different drugs and everything about them

Extracts from this document...


What is a drug? A drug is a substance which alters the way that the body works Define the following words Addiction - When someone is dependant on a drug and can't do without it. Overdose - Taking more of a drug than is recommended. Can lead to death. Neurone - A single cell that carries impulses. Myelin Sheath - The coating on the neurons (nerve cells) that acts as an insulator to speed the conduction of nerve impulses. Synapses - Impulses are carried from one neurone to the next across a gap called a synapse. Tolerance - You body gets used to the drug and you need more to have the same effect. Dependence - A state in which the use of a drug is necessary for either physical or psychological well being. Drug - A chemical designed to change the way your body works. Drugs to study Stimulants - A stimulant is a drug that affects the body by making it work over time. It works in short periods of time. * Examples - The most popular stimulants are cocaine and methamphetines. Others are nicotine, speed, and caffeine. * Effects - Stimulants affect the heart by making the heart work over time. Stimulants also affect your brain's award system, pulse rate, and blood pressure. They make you throw up, lose your appetite, and make you have chess pains. ...read more.


After effects include depression, hangover-type symptoms, memory loss and uncharacteristic behaviour. Long-term effects include: weight loss, anaemia, sores around the mouth and nose tinnitus (ringing in the ears), unconsciousness, seizures and angina. * When you try to stop, what happens? - Although some withdrawal symptoms may persist for several days, solvents are not thought to cause physical dependence. Alcohol - Alcohol acts as a depressant and causes much more harm than illegal drugs like heroin and cannabis. It is a tranquilliser, it is addictive, and is the cause of many hospital admissions for physical illnesses and accidents. * Examples - ethyl alcohol, or ethanol * Effects - Many people enjoy a drink without any problems. But binge drinking or drinking heavily over longer periods of time can have very serious consequences such as brain damage, cancers, heart and liver damage, mental health problems and fertility problems. * Warning signs that you may be addicted - you do not feel right without a drink or need a drink to start the day, you get very shaky sweaty and anxious a few hours after your last drink, you can drink a lot without becoming drunk, you need to drink more and more to get the same effect, you try to stop but find you can't, you carry on drinking even though you can see it is interfering with your work family and relationships and you get "memory blanks" where you can't remember what happened for a period of hours or days. ...read more.


Cannabis - * Examples - Marijuana * Effects - Some people may feel chilled out, relaxed and happy, while others have one puff and feel sick. Others get the giggles and may become talkative. Hunger pangs are common and users may also become more aware of their senses or get a feeling of slowing of time, which are due to its hallucinogenic effects. Regular, heavy use makes it difficult to learn and concentrate. Some people begin to feel tired all the time and can't seem to get motivated. * When you try to stop, what happens? - Cravings, irritability, mood changes, appetite disturbance, weight loss, difficulty sleeping, sweating, shaking and diarrhoea in some people. * Risks - Cannabis affects your coordination, which is one of the reasons why drug driving is just as illegal as drink driving. It can cause lung disease and possibly cancer with long-term or heavy use. It can make asthma worse, and cause wheezing in non-asthma sufferer. It can increase the heart rate and can affect blood pressure. If you use cannabis and have a family background of mental illness, such as schizophrenia, you may be at increased risk of developing a psychotic illness. It can cut a man's sperm count, reduce sperm motility, and can suppress ovulation in women and so may affect fertility. If you're pregnant, smoking cannabis frequently may have some association with the risk of the baby being born smaller than expected. * Why people take it - Relaxation, inspiration and for medical use it relieves pain and stress from terminal illness's. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Humans as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Humans as Organisms essays

  1. Marked by a teacher

    Biology Revision notes - Human Biology

    5 star(s)

    Excess mucus can't be moved out of the lungs so smokers need to cough to try and remove it. This is called smokers' cough. Disease caused by smoking: * Cancer - throat, mouth, lungs, oesophagus, bladder * Bronchitis - inflammation of the bronchi - narrower tube * Emphysema - weakened

  2. Science in the news - Cannabis

    Furthermore ''Cannabis has an effect on the heart, similar to the effects of exercise and It may be just as good for the heart as going to the gym'' (ref 4). I find these facts reliable as they have all come from a recent Government report, which I found on the www.drugs.homeoffice.gov.uk website.

  1. Human biology short notes

    * Is a condition in which blood takes along time to clot * When it takes a long time to clot more blood is lost Exchange between Capillaries and Cells * The arterial (artery) end of the capillary forces blood plasma to leak out of the capillary * The blood

  2. How Ultrasound Works.

    When an electric current is applied to these crystals, they change shape rapidly. The rapid shape changes, or vibrations, of the crystals produce sound waves that travel outward. Conversely, when sound or pressure waves hit the crystals, they emit electrical currents.

  1. The Biological and Psychological Impact of Smoking Cigarettes

    Your body is made up of billions of cells that can only be seen under a microscope. These cells are grouped together to make up the tissues and organs of our bodies. They are a bit like building blocks. There are many different types of cells in the body which do different jobs, but they are basically similar.

  2. Should abortion be illegal?

    If a doctor has a moral objection to abortion, she does not have to be involved. However, she should explain this to their patient and make arrangements for her to see another doctor. It is important to act quickly. The earlier a woman decides to have an abortion, the easier it is to get a free abortion on the NHS.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work