Summary
Misused drugs can have significant impacts on health, leading to both physical and mental health issues. Understanding the effects of these drugs and how they interact with the body is crucial for preventing misuse and promoting well-being.
- Pathogen — an organism that causes disease. Example: Bacteria, viruses, fungi, and protists are all types of pathogens.
- Virus — a type of pathogen that replicates inside host cells, often causing the cell to burst. Example: The flu virus enters cells and uses their machinery to reproduce.
- Bacteria — single-celled organisms that can multiply rapidly and release toxins. Example: Vibrio cholerae causes cholera by releasing toxins in the intestines.
- Fungi — organisms that can be single-celled or have a body made of hyphae, often spreading through spores. Example: Athlete's foot is a common fungal infection.
- Protists — often parasitic organisms that use hosts for survival. Example: Plasmodium species cause malaria by living in human blood cells.
Exam Tips
Key Definitions to Remember
- Pathogen: An organism that causes disease.
- Virus: A pathogen that replicates inside host cells.
- Bacteria: Single-celled organisms that can release toxins.
- Fungi: Organisms that spread through spores.
- Protists: Parasitic organisms using hosts for survival.
Common Confusions
- Confusing viruses with bacteria; remember, antibiotics only work on bacteria.
- Misunderstanding the difference between communicable and non-communicable diseases.
Typical Exam Questions
- What is a pathogen? An organism that causes disease.
- How do viruses replicate? By entering host cells and using their machinery to reproduce.
- What is the role of white blood cells? To protect the body by attacking foreign pathogens.
What Examiners Usually Test
- Understanding of how different pathogens cause disease.
- The ability to distinguish between types of pathogens.
- Knowledge of how the immune system responds to infections.
