Tamilnadu BoardEnglish MediumSTD 8ScienceMicro Organisms.4 Marks
Question
How disease causing microorganisms enter into human beings?
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Answer
The disease-causing microbes are called pathogens. They enter into the body through –
Cuts and wounds in the skin, mouth, or nose.
Some pathogens are found in the air and enter into a healthy person by breathing. When a patient sneezes, droplets containing microbes spread into the air. Example: Tuberculosis, Flu.
Some pathogens enter our body through food and water contaminated with the pathogen. Example: Cholera.
Pathogens also enter through blood transfusion from an infected to a healthy person. Example: Aids
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