BLOOD CARDIOVASCULAR SYSTEM LYMPHOID ORGANS
LYMPH NODES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An antigen is ____
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A type of immune cell
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A substance that the immune system recognizes as foreign
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A symptom of an allergic reaction
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A cell that attacks microbes
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Explanation:
Detailed explanation-1: -An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to fight it off. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen.
Detailed explanation-2: -When an antigen enters your body, the B-cells of your immune system inspect it. B-cells have special parts (receptors) that test the antigen to see if they fit together, like a lock and key. If it’s a fit, the B-cell makes chemicals called antibodies that all have the same shape to recognize the antigen.
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