பக்கம்:Physical and Health Education-6 to 10.pdf/306

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| 9. phoid, malaria etc. are all communicable diseases. What are non-conomunicable diseases? Non-communicable diseases have a hereditary tendency and tend to remain chronic. These do not spread from person to person. Diabetes, heart diseases, cancer, rheumatism, genetic disorders etc. are aii riofi Cortirounicable diseases, What is immunity? The resistance of our body to disease is called immunity, irrimunity is the power of resisting the disease and being susceptible to it. What are the bad effects of aicohoi drinking? Alcohol's excessive use poisons tissues; acts a depres sant upon the central nervous system; impairs muscular and mental efficiency; weakens judgement, increases accidents and may lead to insanity; handicaps athletes and players, increases the chances to all kinds of dis ᎾáSᎾS .