Name: 為什麼我們會過敏？- 反應 (Why Do We Get Allergies? - Reactions)
Uploaded: 2021-01-14T05:22:47.000Z
Duration: 2 min 40 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

So springtime is upon us, and the weather is beautiful!

But, if you’re like me, you’re miserable,

and stuck at home with a runny-nosed and puffy eyes.

But why do we have to suffer from the horrible allergies?

Normally we’d make antibodies to fight germs,

it’s making an antibody that recognizes

harmless things such as pollens or animal dander.”

Inside every allergy sufferer, there lies

an immune system that mistakenly produces

When these unfortunate people breathe in the pollen,

the antibody triggers an allergic reaction. But we’re

not just talking about any kind of pollen, here.

It’s commonly thought that allergy-causing pollen

comes from big, pretty flowers like this, (Big Yellow sunflower image onscreen).

But actually, that pollen is too heavy to go airborne.

Allergies are cause by pollens from trees

“When the immune system, somebody who’s allergic,

recognizes these pollens, the immunoglobin E.

activates cells of the immune system, mast cells,

and these mast cells will release chemicals

One of the most well-known chemicals that cause reactions is histamine.

Histamine is a small organic molecule and how

histamine works is as a small chemical messenger,

finds a receptor that’s on many, many cells

For example blood vessels when it binds to that

receptor it tells the blood vessel to become leaky,

which causes the runny nose that you get or for

example they can cause receptors on nerves which

the histamine will activate and that gives you

So if you’re wheezing and sneezing this spring,

when there’s more pollen floating around.

But if you have to go out there, at least pack

some tissues! And maybe some anti-histamines.