Biology (Drugs& the nervous system)
- Created by: morgxnleigh
- Created on: 22-11-15 14:06
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- Biology
- The nervous system
- The nervous system allows the body to respond to changes in the environment in a process usually coordinated by the brain
- Reflex actions are extra-rapid responses to stimuli
- this process also involves the nervous system but bypasses the brain
- Receptors
- groups of specialised cells that can detect changes in the environment called stimuli
- Receptors are often located in the sense organs, such as the ear, eye and skin
- Eyes- light sensitive
- Ears- sound and position of the head
- Tongue- chemicals in food
- Nose- chemicals in the air
- Skin- touch pain temperature and pressure
- Each organ has receptors sensitive to particular kinds of stimulus
- Drugs
- substances that change chemical reactions in the body
- Medical drugs relieve disease and illness, and are extensively tested before being used
- Recreational drugs such as alcohol and tobacco are taken by people because they like the effects they have on their bodies, but they may be addictive
- Cannabis and heroin are illegal recreational drugs that are very addictive
- Alcohol
- slows down signals in the nerves and brain (depressant)
- Small amounts of alcohol help people to relax
- greater amounts lead to a lack of self-control
- Drinkers of alcohol may not realise how much they are consuming, and fall ill as a result
- Long-term effects of alcohol include damage to the liver and brain, and it is often the cause of weight gain
- Nicotine
- Nicotine is the addictive substance in tobacco smoke
- It reaches the brain within 20 seconds and creates a dependency so that smokers become addicted
- EFFECTS: Heart disease and strokes, miscarriage, premature birth and low birth weight, lung cancer, mouth cancer and throat cancer
- The nervous system
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