Plasma cells secrete large amounts of highly specific antibody. Since simple combining of the antibody gene segments does not generate the billions of different antibodies that can be produced, other processes also occur. In rearranging the genes, extra nucleotides are inserted at the J-regions. Recombination of the genes is not precise. Binding of the specific antigen stimulates a B-cell to amplify the immunoglobulin genes so there are many more copies of the immunoglobulin genes.
Damaged tissue releases histamine that attracts white blood cells.
Swelling occurs as capillaries become 'leaky'. Red blood cells leave capillaries, enter the tissue, and release cytokines. White blood cells come to the area and phagocytose cellular debris and bacteria. Choose the most complete answer that is justified by logical inference from the data. At least one parent has to have at least one A allele.