a gland between the lungs and makes white blood cells

obtained by receiving antibodies; since there is no antigen contact and no immune response occurs, no memory B cells are produced; this is short-term immunity

A substance that the body recognizes as foreign; evokes an immune response

protection

found in tissue fluid and plasma, and defends against bacterial cells, viruses, and toxins; also activates complement

an abdominal organ involved in the production and removal of blood cells in most vertebrates and forming part of the immune system.

obtained through antigen exposure; an immune response occurs in the person, in which antibodies and memory B cells are produced; this is long-lasting immunity.

Lymph nodes in the neck region

poison

found in plasma, activates complement, and contains Anti-A and Anti-B, which react with certain red blood cells during transfusions of mismatched blood

A small bean-shaped structure that is part of the body's immune system, and contains white blood cells

It can be acquired by natural events, such as getting a disease or induced artificially, by an injection.

Proteins secreted by cytotoxic T cells to aid in antigen destruction

spleen

DIrect attack, activation of complement, inflammation

organ system in vertebrates that is part of the circulatory system and the immune system

primary and secondary

Lymph nodes in the groin region

again, and anew

found on the surface of most B lymphocytes, and functions in B cell activation

the spongy tissue inside some of your bones

Natural and Artificially

Large phagocytes found in lymph nodes and other tissues of the body

between

found on surfaces of basophils and mast cells; associated with allergic reactions