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  • I get asked all the time what my type is.

  • A negative. What? It’s way more important, what if I need a blood transfusion?

  • Hey blood brothers and sisters, Julian here for DNews from the youtube space in LA

  • Even if you don’t know your blood type youve probably heard the terms thrown around before.

  • AB positive. O negative. What do they mean?

  • It turns out there are actually 33 different systems for categorizing a person’s blood,

  • but the nomenclature youre most familiar with is a combination of two of them;

  • the ABO system and the Rh system.

  • The reason these two are so much more well known is because they are by and large the

  • most important factors in blood transfusions. In most cases these alone should be enough

  • for a doctor to know what kind of blood to pump back into you if youve sprung a leak.

  • It’s why some racing drivers in the ‘70s and ‘80s had their blood type sewn on their race suit

  • or painted on their car. Nowadays they don’t bother; the tests to determine blood types and compatibility with donor blood

  • are quick and much more foolproof than relying on embroidery or a sticker.

  • So what do the letters and plus/minus symbols actually denote?

  • Theyre describing little surface markers on the blood cells called antibody generators, or antigens for short.

  • Antigens come in a lot of different varieties and your body’s immune system attacks cells

  • with antigens that don’t match your own. Having the right antigens is like knowing

  • the password to get into the super secret, boys-only treehouse.

  • Antigens can be either proteins or sugars. The antigens described by the ABO blood group system

  • are sugars and they come in 4 different combinations ortypes”.

  • Type O means the blood cells have no A or B antigens, so it might be easier to think of it as type Zero.

  • People with this blood type can only receive type O because their immune systems

  • will attack anything with an A or B antigen. But any other blood type can accept type O blood

  • because the red blood cells will be ignored by the immune system.

  • Type A means cells have the A antigen so they can’t receive type B blood,

  • and type B means cells have the B antigen and won’t be compatible with type A blood. I think you see where this is going:

  • type AB means the red blood cells have both A and B antigens,

  • and so none of the white blood cells will attack anything with A or B antigens.

  • People with this blood type can accept any all human blood. Well, so long as the Rh antigens are correct too.

  • The Rh blood group system is so named because 75 years ago it was discovered the antigens behaved

  • similarly to those in Rhesus macaques. But they are different,

  • so don’t go around injecting monkey blood all willy-nilly. Rh antigens are proteins, there are 49 varieties

  • but one in particular, RhD, is highly immunogenic, meaning immune systems that don’t have it

  • freak out when they encounter it. So if you have RhD, your blood type has a plus symbol next to it

  • and you can only donate to other positive blood types, but you can accept positive

  • and negative blood types. Put the two together and it means O- is the universal donor,

  • while AB+ will be the universal receiver.

  • Blood types are passed down through your genes. You can change blood type, but it’s extremely rare.

  • It either happens from some sort of illness, or if you get a bone marrow transplant

  • your blood will eventually convert to your donor’s type.

  • So now you know! Unless you have some rare blood type that needs one of the other 31 blood group systems to describe it,

  • you now understand what the letters and symbols of your blood type mean.

  • In some places like Japan it’s believed that blood types also correspond to personality traits,

  • but really it only affects your immune system. Thinking Type O blood makes a person confident and controlled

  • is kind of like thinking Jupiter is going to affect your luck today.

  • Speaking of, here’s Laci talking about why Astrology is silly.

  • Check the description for a link if youre on your mobile.

  • Are there any other things like blood types you take for granted because you just never thought about it?

  • If you want us to to explain them, go ahead and ask us in the comments,

  • it’s what were here for. I’ll see you next time on DNews.

I get asked all the time what my type is.

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B1 US blood blood type immune antigen system donor

Why Do We Have Different Blood Types?

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    陳叔華 posted on 2016/08/02
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