Biology

Biology, 23.06.2019 01:00, durham953

How is the expression of surface antigens on red blood cells determined?

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Biology, 13.07.2019 06:00, katherineweightman

Which of the formed elements of the blood determines abo blood types? a. white blood cells b. red blood cells c. antibodies d. plasma i know that the answer is either red blood cells or antibodies and i know this: red blood cells have special molecules called antigens on their surfaces. each person has either the a antigen, the b antigen, both the a and b antigens, or none of the antigens on their red blood cells. a person’s immune system will respond to these antigens by reacting with protein antibodies, which circulate in their blood plasma. but, i'm still not sure which is the correct answer.

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Medicine, 19.07.2019 21:30, ingridskoerber

An antigen is a substance that can activate the immune system to produce antibodies. in the blood, the reaction of antibodies and antigens can cause clumping - never a good thing. the abo and rh blood typing systems are based on certain antigen molecules on the plasma surfaces of red blood cells. type 0- blood has been identified as universal donor blood type because it has "zero" antigens to a, b or rh on its red blood cells - so there is no danger of a recipient's anti-a, anti-b or anti-rh antibodies clumping the donated "o" red blood cells during a transfusion. in contrast, a different blood type is called the universal recipient blood type. what blood type is called the universal recipient blood type, and why? a. the universal recipient blood is ab+. because it has the a, b and rh antigens on its cell membranes, it has no antibodies to a, b or rh antigens its blood plasma. if it did, the blood would agglutinate itself, so to speak. therefore, there is no danger of an ab+ recipient's blood clumping donated red blood cells which have a, b or rh antigens. b. the universal recipient blood is abo. it does not contain any anti-a, anti-b, or anti-rh antibodies in its plasma. therefore, type ab- blood does not clump any donor’s red blood cells containing a, b, or rh antigens. c. the universal recipient blood is 0- that has been cross-matched for minor antigens. d. none of the above

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Health, 22.07.2019 23:30, imello51

Select the statement that best describes the specific roles of white blood cells in the immune response. a. platelets and antigens are types of white blood cells that control the immune response. b. t cells and c cells produce antigens that are able to recognize and attack cells with antibodies. c. platelets and red blood cells produce antigens, which allows t cells and b cells to recognize antibodies. d. t cells attack antigens on foreign substances and b cells produce antibodies.

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Health, 25.07.2019 01:00, alwaysneedhelp84

Select the statement that best describes the specific roles of white blood cells in the immune response. a. platelets and antigens are types of white blood cells that control the immune response. b. t cells and c cells produce antigens that are able to recognize and attack cells with antibodies. c. platelets and red blood cells produce antigens, which allows t cells and b cells to recognize antibodies. d. t cells attack antigens on foreign substances and b cells produce antibodies.

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