Human Health and Diseases P-1 | Common Infectious Diseases in Man |12th BIOLOGY | NEET and Board

This video starts with a discussion on Biology chapter Human Health and Diseases part-1, NEET Biology Preparation | By Yoganandam Sir | Edall. Common infectious diseases explained fron this topic. This lecture states about the bacterial,viral.fungal.protozoan and helminth diseases.

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Health is not just the absence of disease. It is a state of complete physical,
mental, social and psychological well-being. Diseases like typhoid, cholera, pneumonia, fungal infections of skin, malaria and many others are a major cause of distress to human beings. Vector-borne diseases
like malaria especially one caused by Plasmodium falciparum, if not
treated, may prove fatal. Besides personal cleanliness and hygiene,
public health measures like proper disposal of waste, decontamination
of drinking water, control of vectors like mosquitoes and immunisation
are very helpful in preventing these diseases. Our immune system plays the major role in preventing these diseases when we are exposed to
disease-causing agents. The innate defences of our body like skin,
mucous membranes, antimicrobial substances present in our tears,
saliva and the phagocytic cells help to block the entry of pathogens
into our body. If the pathogens succeed in gaining entry to our body,
specific antibodies (humoral immune response) and cells (cell mediated
immune response) serve to kill these pathogens. Immune system has
memory. On subsequent exposure to same pathogen, the immune
response is rapid and more intense.

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