Antibodies and Tissue Injury

Which cells release reactive oxygen species and lysosomal enzymes that damage adjacent tissues when activated at sites of antibody deposition?

Which type of antibodies activate the complement system by the classical pathway, resulting in the production of complement by-products that recruit leukocytes and induce inflammation?

Which disease is caused by autoantibodies specific for a protein required for absorption of vitamin B12, resulting in a multisystem disease due to B12 deficiency?