02 什么是 "过敏性鼻炎"?What is Allergic Rhinitis?

未能成功加载,请稍后再试
0/0

Allergic Rhinitis "Rhin" comes from Greek word, meaning "nose", and "itis" means inflammation.

So it means "Inflammation of the Nose" and "Allergic" means it's caused by allergens.

Allergens are anything harmless (or neutral) that can be inhaled in air by nose and trigger excessive immune reaction.

Common examples of allergens include pollen and dust.

Once inside nose, they will meet immune system, particularly Mast cells attached to IgE antibodies.

Allergen will bind to IgE antibody which will then activate and alert Mast cells.

In a normal person, the reaction is minimal.

But in those suffering from Allergic rhinitis, this cell over-reacts big time.

It signals to all cells in surrounding by releasing histamine.

Histamine will now cause inflammation and swelling up of nasal mucosa which will then cause excessive mucus production.

下载全新《每日英语听力》客户端,查看完整内容