Summary and Exam Tips for Diseases
Diseases are a subtopic of Human Health, which falls under the subject Science in the IB MYP curriculum. Diseases are conditions that disturb the state of ease, leading to discomfort. They can be classified based on duration (chronic or acute) and cause (infectious or non-infectious). Chronic diseases like diabetes and cancer persist over time, while acute diseases such as the common cold and diarrhoea are short-lived. Infectious diseases are caused by pathogens like bacteria, viruses, fungi, protozoa, and worms, and can spread through air, food/water, direct or indirect contact, and vectors. Non-infectious diseases result from internal factors like genetics, poor nutrition, pollution, and lack of public services.
Pathogens spread diseases by entering the body through various means. For instance, airborne diseases like COVID-19 spread through sneezing or coughing, while waterborne diseases like cholera spread through contaminated water. Direct contact can spread diseases like AIDS, while vectors like mosquitoes spread malaria. Organ and tissue-specific manifestations occur when pathogens target specific areas, such as the brain in Japanese Encephalitis or lymphatic tissue in AIDS.
Exam Tips
- Understand Classification: Be clear on how diseases are classified based on duration and cause. This is crucial for identifying disease types in exams.
- Pathogen Types: Memorize the different types of pathogens and examples of diseases they cause, such as bacteria causing typhoid and viruses causing influenza.
- Means of Spread: Know the various ways diseases spread, such as through air, water, direct contact, and vectors. This will help in answering questions on disease transmission.
- Organ-Specific Manifestations: Be familiar with how certain diseases affect specific organs or tissues, as this can often be a focus in exam questions.
- Practice Questions: Regularly attempt practice questions to test your understanding of the causes and spread of diseases, which will aid in retention and recall during exams.
