What is diapedesis and chemotaxis?
Killer lymphocytes which attack tumor cells and some cells infected by viruses are also considered part of the innate immune system. (That’s really what they are called!) Acquired immunity: This part of the immune system forms specific antibodies and activated lymphocytes against foreign substances (antigens) only after a prior exposure to the substance. The acquired immune system is divided into humoral and cell mediated immunity. Antigens are foreign proteins with various polysaccharides located on its surface which make it unique. Humoral immunity: The primary cell involved is the B lymphocyte. This cell produces antibodies, which attack specific antigens. The B lymphocytes look like other lymphocytes under the microscope. They are formed in the bone marrow, but during early development they migrate to the liver to be “pre-processed” to perform the function of antibody production. c) Why are they called B lymphocytes? d) Name several antigens. Antibodies originate from B lymphocytes
