Placeholder Image

Subtitles section Play video

  • Smart Learning for All

  • What is an allergy?

  • It is a magic spell.

  • No.

  • Allergy is an overreaction of our immune system to usually harmless substances.

  • Like peanuts, milk, pollen, etc.

  • These substances are called allergens.

  • Our immune system has white blood cells or lymphocytes which protect us from foreign invaders.

  • Such as bacteria, viruses, parasites, etc.

  • These invaders are called antigens.

  • When a lymphocyte detects an antigen, it produces antibodies.

  • Antibodies destroy antigens and thus, protect us.

  • Now, if an allergen such as pollen is inhaled by an allergic person.

  • The lymphocytes of the allergic person for unknown reasons think that the allergen is an antigen.

  • Hence, lymphocytes overreact and produce antibodies which start attacking the allergen.

  • Besides this, as a protective response, some immune cells also trigger production of excess mucus.

  • Resulting in running nose.

  • They even give rise to itching throat and watery eyes, thus causing an allergy.

  • For more educational videos, please download 'Smart Learning For All' Android App from Google Play Store.

  • Also, don't forget to subscribe to our YouTube channel.

Smart Learning for All

Subtitles and vocabulary

Click the word to look it up Click the word to find further inforamtion about it