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Cause and Effect — From Healthy Habits to a Healthy Life
The chain of good health
Good habits and a clean environment build a strong body and mind. A strong immune system then fights off germs. Vaccines and clean living prevent diseases before they start. So healthy choices lead to a long, healthy life.
Mind Map
Health: The Ultimate Treasure
Class 8 — Chapter 3
3.1
Meaning of Health
Physical, mental, and social well-being — not just no disease.
3.2
Staying Healthy
Healthy lifestyle and clean environment keep us well.
3.3
Knowing We Are Unwell
Symptoms are felt; signs are seen or measured.
3.4
Diseases
Communicable spread by pathogens; non-communicable from lifestyle.
3.5
Prevent and Control
Immunity, vaccines, and antibiotics fight diseases.
Key Terms and Definitions
- Health
- Complete physical, mental, and social well-being — not just the absence of disease.
- Lifestyle
- How we live each day — what we eat, how much we move, and how we rest.
- Balanced Diet
- Food that gives the right mix of nutrients, like fruits, vegetables, and whole grains.
- Air Quality Index (AQI)
- A number that tells us how clean or polluted the air around us is.
- Symptom
- Something we feel inside, like pain, tiredness, or dizziness.
- Sign
- Something that can be seen or measured, like fever, rash, or swelling.
- Disease
- A condition that affects the normal working of the body or mind.
- Pathogens
- Disease-causing germs like bacteria, viruses, fungi, worms, or protozoa.
- Communicable Diseases
- Diseases caused by pathogens that spread from one person to another.
- Non-communicable Diseases
- Diseases not caused by pathogens and that do not spread, linked to lifestyle.
- Vectors
- Insects like mosquitoes and houseflies that carry pathogens and spread disease.
- Parasites
- Organisms that live in or on another living being and feed on it.
- Deficiency Diseases
- Diseases caused by a lack of nutrients, like scurvy, anaemia, and goitre.
- Chronic Diseases
- Diseases that last a long time, often more than 3 months.
- Immunity
- The natural ability of our body to fight diseases.
- Vaccine
- Something that trains the immune system to recognise and fight harmful germs.
- Acquired Immunity
- Protection that develops after exposure to a pathogen or a vaccine.
- Antibiotics
- Medicines that kill the bacteria causing a disease; they do not work on viruses.
- Antibiotic Resistance
- When bacteria survive and multiply despite treatment with an antibiotic.
