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What cells engulf antigens and present fragments of them on their own surfaces where they can be recognized by cells that will deal with them?
Wiki User
∙ 13y ago
dendritic cells
Wiki User
∙ 13y ago
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What are the cells that combine with foreign antigens and present them to t cells called?
Macrophages
Langerhans cells are the mechanism of action of which function of skin?
They are the antigen presenting cells (APCs) of the skin. They capture antigens and then migrate to the lymph nodes where they present to T cells.
How is blood type o a universal doner?
There are 4 blood types (A, AB, B, and O) excluding the pos or neg aspect, which are all based on the Antigens on the surface of the Red Blood Cells (RBCs). These antigens are what Antiboies detect and bind to and, because antibodies each bind two antigens, they join up all the cells making massive structures that cannot flow through the blood and cause clots. So for example the A antigen will be detected by the anti-A antibody and cause the clott to be forlmed. For this reason we do not have in our systems the antibodies capable of dececting our own antigens, so if you have A antigens (type A blood) you will have only anti-B antibodies and vice versa. If you have both A and B antigens (AB blood) you will have neither anti-A nor ant-B antibodies. If you have no antigens (type O blood) you will have both the anti-A and anti-B antibodies. Recieving donor blood which as antigens to which your own antibodies will be atracted will mean that the blood you receive is clotted up. For exampl is a type A (has anti-B antibodies) receives type B blood (has B antigens) then the antibodies will bind the donor cells. However if a type AB (no antibodies) receives any sort of donor blood it will accept it freely as there are no antibodies tobind any antigens. This is why AB type is known as the Universal Reciever, as it can receive blood from any blood type donor. So if a type O (with both antibodies) receives A type or B type or AB type donor blood then it has antibodies that will bind any of them causing a clot. However O type blood also has no antigens on it RBCs so no matter what antibodies are present the cells will not be bound. This means tha O type donor blood can be put into any resipient without feer the recipients antibodies will bind the cells, and thus O type blood is known as the Universal Donor.
What is the difference between blood types?
The red blood cells define the blood group you actually belong to. There are small markers known as antigens on the red cells surface, but they are so tiny that it cannot be viewed under a microscope. However, every person has different antigens but for identical twins. The antigens identify the blood types and are the key to match the transfusions as well that helps in avoiding serious complications. The blood group structure is defined as the ABO system. Another significant factor worth considering is the Rh system. All the blood groups have the possibility of having Rh antigens. Conversely, there are some who have it, while some do not have it. In case, the blood group belongs to Rh antigens, then they are Rh positive and a person having A blood group with Rh positive is recognized as A+. In case a person has A blood group with Rh negative, then it is A-. This is the same pattern followed for O, B or AB blood group as well. The Rh system duals the blood groups effectively so that the positive blood type does not get mixed with negative.
What is the difference between negative and positive blood types?
Negative and Positive blood types refer to the presence of the Rhesus D (RhD) antigen. Rhesus is the second main blood group typing after the A,B,O system. e.g. AB+ means the blood cells have A and B and RhD antigens present on the blood cell surface. O- means that A and B and RhD antigens are not present on the surface of the blood cell.
Antigens are typically present on what?
Antigens are typically present on any cell, bacterium, or virus.
In serum antigen present or not?
Yes, serum does contain antigens
Which antibody and antigen combination match each blood type?
The blood type notation A Rh- indicates which antigens and antibodies are present in the blood. A indicates there are A antigens. Rh+ indicates there are Rh antigens. B antibodies. If there are A and Rh antigens but no B antigens, the antibodies in the blood plasma are B antibodies.
Which antigens are present in your plasma if you have type O blood?
Your blood type is determined by antibodies (both/either A and B), and Antigens present (both/either A and B) in your Red Blood Cells. O blood types have both A and B antibodies, and neither A or B antigens. If you are O+ it means you can give blood to anyone. If you are O- it means you can recieve any blood type.
A person's ABO blood type is determined by antigens present on the?
gamma globulins
What are the cells that combine with foreign antigens and present them to t cells called?
Macrophages
How do drug blood tests work?
Im guessing that the testing medium contains antigens which bind to a receptor only present on the drug in question, or a range of drugs with a range of antigens.
What is a histocompatibility antigen?
Histocompatibility antigens are molecules on the surface of all cells in the body. The specific types of histocompatibility antigens present on a person's cells determine their identity and distinguish each person. They are a "fingerprint."
What ABO agglutinogens are present on the red blood cells of MrGreen's blood?
A and B antigens are present on the red blood cells of Mr. Greens Blood.
What are antigens on red cells?
they are substances present in surface of rbc used to determin bld group and genotype
Is a persons blood type genetically determined?
Yes. Blood type is determined by the antigens present on the surfaces of red blood cells. There are three types of antigen, A, B and Rhesus. O blood types have neither A or B antigens. A types have A, B have B, and AB have both. Positive blood types have rhesus antigens, and negative blood types do not. Which antigens are produced is genetically determined.
Do genes for all possible antigens already exist in the body cells and can be just switched on to produce a particular antibody?
There can be billions types of possible antigens and only 20,000 to 25,000 genes are present in body. So the answer is NO.
