Summary
The topic of drugs in biology covers the effects of substances like alcohol and tobacco on the human body, focusing on how they are metabolized and their impact on health.
- Liver — an organ that detoxifies substances like alcohol and drugs. Example: The liver breaks down alcohol to remove toxins from the body.
- Cirrhosis — a condition where the liver is damaged due to excessive alcohol consumption. Example: Long-term alcohol use can lead to liver cirrhosis.
- Antibiotics — drugs used to treat bacterial infections, not viral infections. Example: Antibiotics can treat bacterial pneumonia but not the flu.
- Addiction — a dependency on substances like alcohol, leading to withdrawal symptoms. Example: Alcohol addiction can cause severe withdrawal symptoms when stopping.
- Tar — a substance in cigarette smoke that contributes to lung diseases. Example: Tar deposits in the lungs can lead to cancer.
- Carbon Monoxide — a gas that binds to haemoglobin, reducing oxygen transport. Example: Carbon monoxide from smoking reduces oxygen levels in the blood.
Exam Tips
Key Definitions to Remember
- Liver: Detoxifies substances like alcohol and drugs
- Cirrhosis: Liver damage from excessive alcohol
- Antibiotics: Treat bacterial infections, not viral
- Addiction: Dependency on substances
- Tar: Substance in smoke causing lung diseases
- Carbon Monoxide: Gas reducing oxygen transport
Common Confusions
- Antibiotics treat viral infections
- Tar blocks arteries
- Alcohol stimulates the nervous system
Typical Exam Questions
- What organ detoxifies alcohol? The liver
- Why don't antibiotics work on viruses? Viruses lack cell walls
- What is a consequence of smoking? Increased risk of lung cancer
What Examiners Usually Test
- Effects of alcohol on the liver
- Differences between bacterial and viral infections
- Impact of smoking on lung health