Presentation on theme: "Leukemia is characterized by abnormal white blood cells."— Presentation transcript:
1KEY CONCEPT When the immune system is weakened, the body cannot fight off disease.
2Leukemia is characterized by abnormal white blood cells. Leukemia is cancer of the bone marrow.characterized by immature B-cellscauses weakened immune system
3Leukemia leads to opportunistic infections. occur because white blood cells cannot fight infectionsif immune system were healthy, it would fight these infections
4HIV targets the immune system. The human immunodeficiency virus (HIV) is a RNA retrovirus.attacks and weakens the immune systemis transmitted by mixing infected blood with a bodily fluid
5HIV infection leads to AIDS. T celldead T cellantibodyactivated B cellHIV reproduces in and destroys T cells.The body cannot replace T cells fast enough.T cells cannot help in immune responses.
6AIDS is acquired immune deficiency syndrome. several opportunistic infections = infections succeed because T cells are gone—they take opportunity to survivevery low amount of T cells (less than 200 T Cells)