A)Antibodies destroy antigens by penetrating their cell membranes.
B)The only class of antibodies that can cross the placenta is IgM.
C)The IgA class of antibodies is found on mucous membranes and in breast milk.
D)Antibodies render toxins harmless because they change the shape of the toxins.
E)Antibodies label foreign antigens, and such a label stimulates phagocytosis by macrophages.
F)Antibodies are effective against viruses because they disable the nucleic acid of the virus.

A)Lymph nodules are found in all mucous membranes.
B)Lymph nodes are found along the pathways of lymph vessels.
C)Both nodes and nodules contain macrophages and lymphocytes.
D)The tonsils and Peyer's patches are the lymphatic tissue of the pharynx.
E)Two of the most important paired groups of lymph nodes are the axillary and the inguinal nodes.
F)Within nodes and nodules, antibodies are produced by IG cells.

A)intracellular fluid
B)plasma
C)tissue fluid
D)lymph